diff --git a/main.py b/main.py
index 8a4c87d..11d7f49 100644
--- a/main.py
+++ b/main.py
@@ -1,10 +1,13 @@
 import sys
 import os
 import json
-from PyQt5.QtWidgets import QApplication, QMainWindow, QFileDialog, QListWidgetItem, QLabel, QDesktopWidget
-from PyQt5.QtCore import QDir, QFileSystemWatcher
+from PyQt6.QtWidgets import QApplication, QMainWindow, QFileDialog, QListWidgetItem, QLabel
+from PyQt6.QtCore import QDir, QFileSystemWatcher, Qt
+from PyQt6.QtGui import QGuiApplication
 from startWindow import Ui_startWindow as Ui_StartWindow
 from mainWindow import Ui_MainWindow as Ui_MainWindow2
+from qt_markdown.qt_markdown import QtMarkDown
+
 
 CONFIG_FILE = "catalogs.json"
 
@@ -23,10 +26,11 @@ class StartWindow(QMainWindow):
         self.load_catalogs()
 
     def window_center(self):
-        qr = self.frameGeometry()
-        cp = QDesktopWidget().availableGeometry().center()
-        qr.moveCenter(cp)
-        self.move(qr.topLeft())
+        screen = QGuiApplication.primaryScreen()
+        screen_geometry = screen.geometry()
+        window_geometry = self.frameGeometry()
+        window_geometry.moveCenter(screen_geometry.center())
+        self.move(window_geometry.topLeft())
 
     def create_catalog(self):
         folder_path = QFileDialog.getSaveFileName(self, "Create New Catalog", "", "All Files (*);;Directory")[0]
@@ -88,6 +92,7 @@ class MainWindow(QMainWindow):
             self.create_file()
             self.ui.noteTitleEdit.textChanged.connect(self.save_note_title)
             self.ui.noteEdit.textChanged.connect(self.save_note_content)
+            self.show_note_edit_and_toolbar()
         else:
             self.show_default_label()
 
@@ -97,6 +102,9 @@ class MainWindow(QMainWindow):
         self.file_watcher.addPath(self.folder_path)
         self.file_watcher.directoryChanged.connect(self.show_directory_files)
 
+        self.qt_markdown = QtMarkDown(self.ui.noteEdit)
+
+
     def load_selected_note(self, item):
         note_name = item.text()
         self.default_note_path = os.path.join(self.folder_path, note_name)
@@ -104,9 +112,23 @@ class MainWindow(QMainWindow):
         self.ui.noteTitleEdit.setPlainText(note_name)
         self.ui.noteTitleEdit.show()
         self.ui.noteEdit.show()
+        self.show_note_edit_and_toolbar()
+
         if hasattr(self, 'static_label'):
             self.static_label.hide()
 
+        # Подключаем сигналы для автосохранения
+        self.ui.noteTitleEdit.textChanged.connect(self.save_note_title)
+        self.ui.noteEdit.textChanged.connect(self.save_note_content)
+
+    def show_note_edit_and_toolbar(self):
+        if not hasattr(self, 'toolbar'):
+            self.qt_markdown = QtMarkDown(self.ui.noteEdit)
+            self.toolbar = self.qt_markdown.get_toolbar()
+
+        self.ui.noteEdit.show()
+        self.ui.verticalLayout.insertWidget(0, self.toolbar)
+
     def create_file(self):
         base_name = "Без_Имени"
         extension = ".md"
@@ -152,7 +174,7 @@ class MainWindow(QMainWindow):
     def show_directory_files(self):
         if os.path.exists(self.folder_path):
             self.ui.mainList.clear()
-            dir_content = QDir(self.folder_path).entryList(QDir.Files)
+            dir_content = QDir(self.folder_path).entryList(QDir.Filter.Files)
             for file_name in dir_content:
                 item = QListWidgetItem(file_name)
                 self.ui.mainList.addItem(item)
@@ -160,6 +182,8 @@ class MainWindow(QMainWindow):
     def show_default_label(self):
         self.ui.noteTitleEdit.hide()
         self.ui.noteEdit.hide()
+        if hasattr(self, 'toolbar'):
+            self.toolbar.hide()
 
         if not hasattr(self, 'static_label'):
             self.static_label = QLabel("Выберите файл из списка или создайте новый")
@@ -176,4 +200,4 @@ if __name__ == "__main__":
     app = QApplication(sys.argv)
     start_window = StartWindow()
     start_window.show()
-    sys.exit(app.exec_())
+    sys.exit(app.exec())
diff --git a/mainWindow.py b/mainWindow.py
index 76495d2..f771822 100644
--- a/mainWindow.py
+++ b/mainWindow.py
@@ -1,30 +1,28 @@
-# -*- coding: utf-8 -*-
-
-# Form implementation generated from reading ui file '/home/merelden/Документы/NoteQt/mainWindow.ui'
+# Form implementation generated from reading ui file '/home/evgeniy/Документы/Note_Qt/mainWindow.ui'
 #
-# Created by: PyQt5 UI code generator 5.15.10
+# Created by: PyQt6 UI code generator 6.7.0
 #
-# WARNING: Any manual changes made to this file will be lost when pyuic5 is
+# WARNING: Any manual changes made to this file will be lost when pyuic6 is
 # run again.  Do not edit this file unless you know what you are doing.
 
 
-from PyQt5 import QtCore, QtGui, QtWidgets
+from PyQt6 import QtCore, QtGui, QtWidgets
 
 
 class Ui_MainWindow(object):
     def setupUi(self, MainWindow):
         MainWindow.setObjectName("MainWindow")
         MainWindow.resize(800, 600)
-        self.centralwidget = QtWidgets.QWidget(MainWindow)
+        self.centralwidget = QtWidgets.QWidget(parent=MainWindow)
         self.centralwidget.setObjectName("centralwidget")
         self.verticalLayout_2 = QtWidgets.QVBoxLayout(self.centralwidget)
         self.verticalLayout_2.setObjectName("verticalLayout_2")
         self.horizontalLayout = QtWidgets.QHBoxLayout()
         self.horizontalLayout.setObjectName("horizontalLayout")
-        self.back = QtWidgets.QPushButton(self.centralwidget)
+        self.back = QtWidgets.QPushButton(parent=self.centralwidget)
         self.back.setObjectName("back")
         self.horizontalLayout.addWidget(self.back)
-        self.createFile = QtWidgets.QPushButton(self.centralwidget)
+        self.createFile = QtWidgets.QPushButton(parent=self.centralwidget)
         font = QtGui.QFont()
         font.setPointSize(10)
         self.createFile.setFont(font)
@@ -33,17 +31,17 @@ class Ui_MainWindow(object):
         self.verticalLayout_2.addLayout(self.horizontalLayout)
         self.horizontalLayout_2 = QtWidgets.QHBoxLayout()
         self.horizontalLayout_2.setObjectName("horizontalLayout_2")
-        self.mainList = QtWidgets.QListWidget(self.centralwidget)
+        self.mainList = QtWidgets.QListWidget(parent=self.centralwidget)
         self.mainList.setMaximumSize(QtCore.QSize(150, 16777215))
         self.mainList.setObjectName("mainList")
         self.horizontalLayout_2.addWidget(self.mainList)
         self.verticalLayout = QtWidgets.QVBoxLayout()
         self.verticalLayout.setObjectName("verticalLayout")
-        self.noteTitleEdit = QtWidgets.QTextEdit(self.centralwidget)
+        self.noteTitleEdit = QtWidgets.QTextEdit(parent=self.centralwidget)
         self.noteTitleEdit.setMaximumSize(QtCore.QSize(16777215, 30))
         self.noteTitleEdit.setObjectName("noteTitleEdit")
         self.verticalLayout.addWidget(self.noteTitleEdit)
-        self.noteEdit = QtWidgets.QTextEdit(self.centralwidget)
+        self.noteEdit = QtWidgets.QTextEdit(parent=self.centralwidget)
         self.noteEdit.setObjectName("noteEdit")
         self.verticalLayout.addWidget(self.noteEdit)
         self.horizontalLayout_2.addLayout(self.verticalLayout)
diff --git a/qt_markdown/__init__.py b/qt_markdown/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/qt_markdown/__pycache__/__init__.cpython-39.pyc b/qt_markdown/__pycache__/__init__.cpython-39.pyc
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index 0000000..ae3daea
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diff --git a/qt_markdown/__pycache__/qt_markdown.cpython-39.pyc b/qt_markdown/__pycache__/qt_markdown.cpython-39.pyc
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index 0000000..3937f79
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diff --git a/qt_markdown/qt_markdown.py b/qt_markdown/qt_markdown.py
new file mode 100644
index 0000000..4a7a594
--- /dev/null
+++ b/qt_markdown/qt_markdown.py
@@ -0,0 +1,10 @@
+from .text_formatter.text_formatter import TextFormatter
+from .toolbar.toolbar import FormattingToolbar
+
+class QtMarkDown:
+    def __init__(self, text_edit):
+        self.text_formatter = TextFormatter(text_edit)
+        self.toolbar = FormattingToolbar(self.text_formatter)
+
+    def get_toolbar(self):
+        return self.toolbar
\ No newline at end of file
diff --git a/qt_markdown/text_formatter/__init__.py b/qt_markdown/text_formatter/__init__.py
new file mode 100644
index 0000000..e69de29
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index 0000000..b2499e6
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diff --git a/qt_markdown/text_formatter/__pycache__/header_formatter.cpython-39.pyc b/qt_markdown/text_formatter/__pycache__/header_formatter.cpython-39.pyc
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index 0000000..dd7e7bb
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diff --git a/qt_markdown/text_formatter/__pycache__/text_formatter.cpython-39.pyc b/qt_markdown/text_formatter/__pycache__/text_formatter.cpython-39.pyc
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index 0000000..cf117ae
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diff --git a/qt_markdown/text_formatter/__pycache__/text_style_formatter.cpython-39.pyc b/qt_markdown/text_formatter/__pycache__/text_style_formatter.cpython-39.pyc
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index 0000000..71860bf
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diff --git a/qt_markdown/text_formatter/header_formatter.py b/qt_markdown/text_formatter/header_formatter.py
new file mode 100644
index 0000000..9642307
--- /dev/null
+++ b/qt_markdown/text_formatter/header_formatter.py
@@ -0,0 +1,45 @@
+from PyQt6.QtGui import QTextCharFormat, QFont, QTextCursor
+from PyQt6.QtCore import QRegularExpression
+
+class HeaderFormatter:
+    def __init__(self):
+        self.regex_h1 = QRegularExpression(r'^#\s(.+)$')
+        self.regex_h2 = QRegularExpression(r'^##\s(.+)$')
+        self.regex_h3 = QRegularExpression(r'^###\s(.+)$')
+        self.regex_h4 = QRegularExpression(r'^####\s(.+)$')
+        self.regex_h5 = QRegularExpression(r'^#####\s(.+)$')
+        self.regex_h6 = QRegularExpression(r'^######\s(.+)$')
+
+    def apply_header_format(self, block, font_size, font_weight):
+        cursor = QTextCursor(block)
+        char_format = QTextCharFormat()
+        char_format.setFontWeight(font_weight)
+        char_format.setFontPointSize(font_size * 16)
+        cursor.select(QTextCursor.SelectionType.BlockUnderCursor)
+        cursor.setCharFormat(char_format)
+
+    def clear_header_format(self, block):
+        cursor = QTextCursor(block)
+        char_format = QTextCharFormat()
+        cursor.select(QTextCursor.SelectionType.BlockUnderCursor)
+        cursor.setCharFormat(char_format)
+
+    def process_headers(self, text_edit):
+        block = text_edit.document().firstBlock()
+        while block.isValid():
+            text = block.text()
+            if self.regex_h1.match(text).hasMatch():
+                self.apply_header_format(block, 2.0, QFont.Weight.Bold)
+            elif self.regex_h2.match(text).hasMatch():
+                self.apply_header_format(block, 1.5, QFont.Weight.Bold)
+            elif self.regex_h3.match(text).hasMatch():
+                self.apply_header_format(block, 1.25, QFont.Weight.Bold)
+            elif self.regex_h4.match(text).hasMatch():
+                self.apply_header_format(block, 1.0, QFont.Weight.Bold)
+            elif self.regex_h5.match(text).hasMatch():
+                self.apply_header_format(block, 0.875, QFont.Weight.Bold)
+            elif self.regex_h6.match(text).hasMatch():
+                self.apply_header_format(block, 0.85, QFont.Weight.Bold)
+            else:
+                self.clear_header_format(block)
+            block = block.next()
\ No newline at end of file
diff --git a/qt_markdown/text_formatter/text_formatter.py b/qt_markdown/text_formatter/text_formatter.py
new file mode 100644
index 0000000..eb86853
--- /dev/null
+++ b/qt_markdown/text_formatter/text_formatter.py
@@ -0,0 +1,69 @@
+from PyQt6.QtWidgets import QTextEdit
+from PyQt6.QtCore import QTimer, QDir, QUrl, QVariant, Qt
+from PyQt6.QtGui import QTextCharFormat, QFont, QTextCursor, QTextImageFormat, QImage, QTextDocument, QTextBlockFormat
+from .header_formatter import HeaderFormatter
+from .text_style_formatter import TextStyleFormatter
+
+class TextFormatter:
+    def __init__(self, text_edit: QTextEdit):
+        self.text_edit = text_edit
+        self.timer = QTimer()
+        self.timer.setSingleShot(True)
+        self.timer.timeout.connect(self.process_text_changes)
+        self.text_edit.textChanged.connect(self.delay_text)
+
+        self.header_formatter = HeaderFormatter()
+        self.text_style_formatter = TextStyleFormatter()
+
+    def delay_text(self):
+        self.timer.start(500)
+
+    def process_text_changes(self):
+        cursor = self.text_edit.textCursor()
+        cursor.beginEditBlock()
+        cursor.select(QTextCursor.SelectionType.Document)
+        cursor.setCharFormat(QTextCharFormat())
+
+        self.header_formatter.process_headers(self.text_edit)
+        self.text_style_formatter.apply_text_formatting(cursor, self.text_edit.toPlainText())
+        self.process_markdown_images(cursor, self.text_edit.toPlainText())
+
+        cursor.endEditBlock()
+
+    def toggle_special_symbols(self, symbol_start, symbol_end=None):
+        cursor = self.text_edit.textCursor()
+        if cursor.hasSelection():
+            selected_text = cursor.selectedText()
+            full_text = self.text_edit.toPlainText()
+            start = cursor.selectionStart()
+            end = cursor.selectionEnd()
+            corrected_text, new_start, new_end = self._toggle_special_symbols_in_selection(full_text, start, end, symbol_start, symbol_end)
+            self.text_edit.setPlainText(corrected_text)
+            cursor.setPosition(new_start)
+            cursor.setPosition(new_end, QTextCursor.MoveMode.KeepAnchor)
+            self.text_edit.setTextCursor(cursor)
+        else:
+            cursor.select(QTextCursor.SelectionType.WordUnderCursor)
+            word = cursor.selectedText()
+            full_text = self.text_edit.toPlainText()
+            start = cursor.selectionStart()
+            end = cursor.selectionEnd()
+            corrected_text, new_start, new_end = self._toggle_special_symbols_in_selection(full_text, start, end, symbol_start, symbol_end)
+            self.text_edit.setPlainText(corrected_text)
+            cursor.setPosition(new_start)
+            cursor.setPosition(new_end, QTextCursor.MoveMode.KeepAnchor)
+            self.text_edit.setTextCursor(cursor)
+
+    def _toggle_special_symbols_in_selection(self, text, start, end, symbol_start, symbol_end=None):
+        if symbol_end is None:
+            symbol_end = symbol_start
+        if text[start - len(symbol_start):start] == symbol_start and text[end:end + len(symbol_end)] == symbol_end:
+            corrected_text = text[:start - len(symbol_start)] + text[start:end] + text[end + len(symbol_end):]
+            new_start = start - len(symbol_start)
+            new_end = end - len(symbol_start)
+            return corrected_text, new_start, new_end
+        else:
+            corrected_text = text[:start] + symbol_start + text[start:end] + symbol_end + text[end:]
+            new_start = start + len(symbol_start)
+            new_end = end + len(symbol_end)
+            return corrected_text, new_start, new_end
\ No newline at end of file
diff --git a/qt_markdown/text_formatter/text_style_formatter.py b/qt_markdown/text_formatter/text_style_formatter.py
new file mode 100644
index 0000000..a453144
--- /dev/null
+++ b/qt_markdown/text_formatter/text_style_formatter.py
@@ -0,0 +1,92 @@
+from PyQt6.QtGui import QTextCharFormat, QFont, QTextCursor
+from PyQt6.QtCore import QRegularExpression
+
+class TextStyleFormatter:
+    def __init__(self):
+        self.regex_bold_italic = QRegularExpression(r'\*{3}([^\*]+)\*{3}')
+        self.regex_bold = QRegularExpression(r'\*{2}([^\*]+?)\*{2}')
+        self.regex_italic = QRegularExpression(r'\*([^\*]+?)\*')
+        self.regex_stroke = QRegularExpression(r'~~([^\~]+?)~~')
+        self.regex_underline = QRegularExpression(r'<u>([^<]+?)</u>')
+
+    def apply_text_formatting(self, cursor, text):
+        # Process bold and italic text
+        pos = 0
+        bold_italic_positions = []
+        while (match := self.regex_bold_italic.match(text, pos)).hasMatch():
+            match_len = match.capturedLength()
+            start = match.capturedStart(0) + 3  # Start of text between asterisks
+            end = start + match_len - 6  # End of text between asterisks
+
+            bold_italic_positions.append((start, end))
+
+            cursor.setPosition(start)
+            cursor.movePosition(QTextCursor.MoveOperation.Right, QTextCursor.MoveMode.KeepAnchor, match_len - 6)
+
+            char_format = QTextCharFormat()
+            char_format.setFontWeight(QFont.Weight.Bold)
+            char_format.setFontItalic(True)
+            cursor.mergeCharFormat(char_format)
+
+            pos = match.capturedEnd(0)
+
+        # Process bold text
+        pos = 0
+        bold_positions = []
+        while (match := self.regex_bold.match(text, pos)).hasMatch():
+            match_len = match.capturedLength()
+            start = match.capturedStart(0) + 2  # Start of text between asterisks
+            end = start + match_len - 4  # End of text between asterisks
+
+            if not any(start < bi_end and end > bi_start for bi_start, bi_end in bold_italic_positions):
+                bold_positions.append((start, end))
+
+                cursor.setPosition(start)
+                cursor.movePosition(QTextCursor.MoveOperation.Right, QTextCursor.MoveMode.KeepAnchor, match_len - 4)
+
+                char_format = QTextCharFormat()
+                char_format.setFontWeight(QFont.Weight.Bold)
+                cursor.mergeCharFormat(char_format)
+
+            pos = match.capturedEnd(0)
+
+        # Process italic text
+        pos = 0
+        while (match := self.regex_italic.match(text, pos)).hasMatch():
+            match_len = match.capturedLength()
+            start = match.capturedStart(0) + 1  # Start of text between asterisks
+            end = start + match_len - 2  # End of text between asterisks
+
+            # Check for overlap with bold or bold and italic text
+            if not any(start < b_end and end > b_start for b_start, b_end in bold_positions) and \
+                    not any(start < bi_end and end > bi_start for bi_start, bi_end in bold_italic_positions):
+                cursor.setPosition(start)
+                cursor.movePosition(QTextCursor.MoveOperation.Right, QTextCursor.MoveMode.KeepAnchor, match_len - 2)
+
+                char_format = QTextCharFormat()
+                char_format.setFontItalic(True)
+                cursor.mergeCharFormat(char_format)
+
+            pos = match.capturedEnd(0)
+
+        pos = 0
+        while (match := self.regex_stroke.match(text, pos)).hasMatch():
+            start = match.capturedStart(1)
+            end = match.capturedEnd(1)
+            cursor.setPosition(start)
+            cursor.movePosition(QTextCursor.MoveOperation.Right, QTextCursor.MoveMode.KeepAnchor, end - start)
+            char_format = QTextCharFormat()
+            char_format.setFontStrikeOut(True)
+            cursor.mergeCharFormat(char_format)
+            pos = match.capturedEnd(0)
+
+        pos = 0
+        while (match := self.regex_underline.match(text, pos)).hasMatch():
+            start = match.capturedStart(1)
+            end = match.capturedEnd(1)
+            cursor.setPosition(start)
+            cursor.movePosition(QTextCursor.MoveOperation.Right, QTextCursor.MoveMode.KeepAnchor, end - start)
+            char_format = QTextCharFormat()
+            char_format.setFontUnderline(True)
+            cursor.mergeCharFormat(char_format)
+            pos = match.capturedEnd(0)
\ No newline at end of file
diff --git a/qt_markdown/toolbar/__init__.py b/qt_markdown/toolbar/__init__.py
new file mode 100644
index 0000000..e69de29
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diff --git a/qt_markdown/toolbar/__pycache__/toolbar.cpython-39.pyc b/qt_markdown/toolbar/__pycache__/toolbar.cpython-39.pyc
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index 0000000..b1d9351
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diff --git a/qt_markdown/toolbar/toolbar.py b/qt_markdown/toolbar/toolbar.py
new file mode 100644
index 0000000..d6b3456
--- /dev/null
+++ b/qt_markdown/toolbar/toolbar.py
@@ -0,0 +1,94 @@
+from PyQt6.QtWidgets import QWidget, QVBoxLayout, QHBoxLayout, QPushButton, QComboBox
+from PyQt6.QtGui import QTextCharFormat, QFont, QTextCursor
+
+class FormattingToolbar(QWidget):
+    def __init__(self, formatter):
+        super().__init__()
+        self.formatter = formatter
+        self.init_ui()
+
+    def init_ui(self):
+        layout = QVBoxLayout()
+        toolbar_layout = QHBoxLayout()
+
+        self.button_bold = QPushButton("Ж")
+        self.button_bold.setStyleSheet("font-weight: bold;")
+        self.button_bold.clicked.connect(lambda: self.formatter.toggle_special_symbols('**'))
+
+        self.button_italic = QPushButton("К")
+        self.button_italic.setStyleSheet("font-style: italic;")
+        self.button_italic.clicked.connect(lambda: self.formatter.toggle_special_symbols('*'))
+
+        self.button_strike = QPushButton("abc")
+        self.button_strike.setStyleSheet("text-decoration: line-through;")
+        self.button_strike.clicked.connect(lambda: self.formatter.toggle_special_symbols('~~'))
+
+        self.button_underline = QPushButton("Ч")
+        self.button_underline.setStyleSheet("text-decoration: underline;")
+        self.button_underline.clicked.connect(lambda: self.formatter.toggle_special_symbols('<u>', '</u>'))
+
+        self.button_header1 = QPushButton("H1")
+        self.button_header1.clicked.connect(self.insert_header1)
+
+        self.button_header2 = QPushButton("H2")
+        self.button_header2.clicked.connect(self.insert_header2)
+
+        self.header_drop = QComboBox()
+        self.header_drop.addItems(["H1", "H2", "H3", "H4", "H5", "H6"])
+        self.header_drop.currentIndexChanged.connect(self.handle_header_drop)
+
+
+        toolbar_layout.addWidget(self.button_bold)
+        toolbar_layout.addWidget(self.button_italic)
+        toolbar_layout.addWidget(self.button_strike)
+        toolbar_layout.addWidget(self.button_underline)
+        toolbar_layout.addWidget(self.button_header1)
+        toolbar_layout.addWidget(self.button_header2)
+        toolbar_layout.addWidget(self.header_drop)
+
+
+        layout.addLayout(toolbar_layout)
+        self.setLayout(layout)
+
+    def insert_header1(self):
+        self.insert_header('# ')
+
+    def insert_header2(self):
+        self.insert_header('## ')
+
+    def insert_header(self, header_symbol):
+        cursor = self.formatter.text_edit.textCursor()
+        cursor.beginEditBlock()
+
+        # Get selected text or word under cursor
+        cursor.select(QTextCursor.SelectionType.WordUnderCursor)
+        selected_text = cursor.selectedText()
+
+        # Check if there's already a header symbol at the beginning
+        cursor.movePosition(QTextCursor.MoveOperation.StartOfLine)
+        cursor.select(QTextCursor.SelectionType.LineUnderCursor)
+        line_text = cursor.selectedText().strip()
+
+        if line_text.startswith('#'):
+            # Remove existing header symbol and space
+            line_text = line_text.replace('#', '', 1).lstrip()
+
+        if selected_text:
+            # Replace the selected text with the header symbol + selected text
+            cursor.removeSelectedText()
+            cursor.insertText(header_symbol + selected_text)
+        else:
+            # If no word is selected, just insert the header symbol
+            cursor.insertText(header_symbol)
+
+        cursor.endEditBlock()
+
+    def handle_header_drop(self, index):
+        header_level = index + 1  # Since index starts from 0, but header levels start from 1
+        header_symbol = '#' * header_level + ' '
+
+        # Set the correct index in the headerDrop ComboBox
+        self.header_drop.setCurrentIndex(index)
+
+        # Call insert_header with the header_symbol
+        self.insert_header(header_symbol)
\ No newline at end of file
diff --git a/startWindow.py b/startWindow.py
index f240fb9..11f75b2 100644
--- a/startWindow.py
+++ b/startWindow.py
@@ -1,21 +1,19 @@
-# -*- coding: utf-8 -*-
-
-# Form implementation generated from reading ui file '/home/merelden/Документы/NoteQt/startWindow.ui'
+# Form implementation generated from reading ui file '/home/evgeniy/Документы/Note_Qt/startWindow.ui'
 #
-# Created by: PyQt5 UI code generator 5.15.10
+# Created by: PyQt6 UI code generator 6.7.0
 #
-# WARNING: Any manual changes made to this file will be lost when pyuic5 is
+# WARNING: Any manual changes made to this file will be lost when pyuic6 is
 # run again.  Do not edit this file unless you know what you are doing.
 
 
-from PyQt5 import QtCore, QtGui, QtWidgets
+from PyQt6 import QtCore, QtGui, QtWidgets
 
 
 class Ui_startWindow(object):
     def setupUi(self, startWindow):
         startWindow.setObjectName("startWindow")
         startWindow.resize(800, 600)
-        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
+        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Policy.Fixed, QtWidgets.QSizePolicy.Policy.Fixed)
         sizePolicy.setHorizontalStretch(0)
         sizePolicy.setVerticalStretch(0)
         sizePolicy.setHeightForWidth(startWindow.sizePolicy().hasHeightForWidth())
@@ -24,32 +22,32 @@ class Ui_startWindow(object):
         startWindow.setMaximumSize(QtCore.QSize(800, 600))
         startWindow.setBaseSize(QtCore.QSize(800, 600))
         startWindow.setAutoFillBackground(False)
-        self.centralwidget = QtWidgets.QWidget(startWindow)
+        self.centralwidget = QtWidgets.QWidget(parent=startWindow)
         self.centralwidget.setObjectName("centralwidget")
         self.verticalLayout_2 = QtWidgets.QVBoxLayout(self.centralwidget)
         self.verticalLayout_2.setObjectName("verticalLayout_2")
         self.horizontalLayout_3 = QtWidgets.QHBoxLayout()
         self.horizontalLayout_3.setObjectName("horizontalLayout_3")
-        self.startWindowList = QtWidgets.QListWidget(self.centralwidget)
+        self.startWindowList = QtWidgets.QListWidget(parent=self.centralwidget)
         self.startWindowList.setMinimumSize(QtCore.QSize(250, 0))
         self.startWindowList.setMaximumSize(QtCore.QSize(252, 16777215))
         self.startWindowList.setStyleSheet("max-width: 250")
         self.startWindowList.setObjectName("startWindowList")
         self.horizontalLayout_3.addWidget(self.startWindowList)
         self.verticalLayout = QtWidgets.QVBoxLayout()
-        self.verticalLayout.setSizeConstraint(QtWidgets.QLayout.SetMinimumSize)
+        self.verticalLayout.setSizeConstraint(QtWidgets.QLayout.SizeConstraint.SetMinimumSize)
         self.verticalLayout.setSpacing(0)
         self.verticalLayout.setObjectName("verticalLayout")
         self.horizontalLayout = QtWidgets.QHBoxLayout()
         self.horizontalLayout.setObjectName("horizontalLayout")
-        self.label = QtWidgets.QLabel(self.centralwidget)
+        self.label = QtWidgets.QLabel(parent=self.centralwidget)
         self.label.setMaximumSize(QtCore.QSize(16777215, 16777215))
         font = QtGui.QFont()
         font.setPointSize(14)
         self.label.setFont(font)
         self.label.setObjectName("label")
         self.horizontalLayout.addWidget(self.label)
-        self.createCatalog = QtWidgets.QPushButton(self.centralwidget)
+        self.createCatalog = QtWidgets.QPushButton(parent=self.centralwidget)
         font = QtGui.QFont()
         font.setPointSize(14)
         self.createCatalog.setFont(font)
@@ -58,8 +56,8 @@ class Ui_startWindow(object):
         self.verticalLayout.addLayout(self.horizontalLayout)
         self.horizontalLayout_2 = QtWidgets.QHBoxLayout()
         self.horizontalLayout_2.setObjectName("horizontalLayout_2")
-        self.label_2 = QtWidgets.QLabel(self.centralwidget)
-        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Preferred, QtWidgets.QSizePolicy.Preferred)
+        self.label_2 = QtWidgets.QLabel(parent=self.centralwidget)
+        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Policy.Preferred, QtWidgets.QSizePolicy.Policy.Preferred)
         sizePolicy.setHorizontalStretch(0)
         sizePolicy.setVerticalStretch(0)
         sizePolicy.setHeightForWidth(self.label_2.sizePolicy().hasHeightForWidth())
@@ -70,7 +68,7 @@ class Ui_startWindow(object):
         self.label_2.setFont(font)
         self.label_2.setObjectName("label_2")
         self.horizontalLayout_2.addWidget(self.label_2)
-        self.openCatalog = QtWidgets.QPushButton(self.centralwidget)
+        self.openCatalog = QtWidgets.QPushButton(parent=self.centralwidget)
         font = QtGui.QFont()
         font.setPointSize(14)
         self.openCatalog.setFont(font)