The Problem is that the windows (Stats, Datatypes) can open out of the monitor borders. Make sure that it always stays within the borders of the monitor. Python 3.12 Code: class Header:
    """Class for handling header UI."""

    DATA_TYPE_OPTIONS = ["string", "integer", "float", "boolean"]

    def __init__(self, root: tk.Tk, app: 'TableApp'):
        self.root = root
        self.app = app
        self.style = app.style
        self.colors = app.colors
        self.fonts = app.fonts
        self.dimensions = app.dimensions
        self.table_name_label = None
        self.lower_header_frame = None
        self.result = None
        self._setup_header()

    def _setup_header(self) -> None:
        header_frame = self._setup_main_frame()
        self._setup_upper_section(header_frame)
        self._setup_lower_section(header_frame)

    def _setup_main_frame(self) -> tk.Frame:
        header_frame = create_frame(parent=self.root, width=None, bg=self.colors["background"])
        header_frame.grid(row=0, column=1, columnspan=2, sticky="ew")
        header_frame.config(height=self.dimensions["header_height"])
        header_frame.grid_propagate(False)
        header_frame.grid_rowconfigure(0, weight=0)
        header_frame.grid_rowconfigure(1, weight=0)
        for i in range(5):
            header_frame.grid_columnconfigure(i, weight=1 if i == 4 else 0)
        return header_frame

    def _setup_upper_section(self, parent: tk.Frame) -> None:
        upper_frame = create_frame(parent=parent, width=None, bg=self.colors["background"])
        upper_frame.grid(row=0, column=0, columnspan=6, sticky="ew", pady=(0, 10))
        upper_frame.grid_columnconfigure(5, weight=1)
        self._add_upper_content(upper_frame)

    def _add_upper_content(self, frame: tk.Frame) -> None:
        tk.Label(frame, text="Data > ", bg=self.colors["background"],
                 fg=self.colors["header_info"], font=self.fonts["header_info"]).grid(
            row=0, column=0, padx=22, pady=(22, 0), sticky="nw")

        self.table_name_label = tk.Label(frame, text=self.app.current_table_name or "No Table Selected",
                                         bg=self.colors["background"], fg=self.colors["text"],
                                         font=self.fonts["header_info"])
        self.table_name_label.grid(row=0, column=0, padx=(88, 10), pady=(22, 0), sticky="nw")

        self._setup_settings_section(frame)

    def _setup_settings_section(self, frame: tk.Frame) -> None:
        settings_container = tk.Frame(frame, bg=self.colors["background"])
        settings_container.grid(row=0, column=5, padx=(0, 40), pady=(22, 0), sticky="ne")

        common_label_options = {
            'bg': self.colors["background"],
            'fg': self.colors["text"],
            'font': self.fonts["text"],
            'cursor': "hand2",
        }

        label_s = tk.Label(
            settings_container,
            text="S",
            **common_label_options
        )
        label_i = tk.Label(
            settings_container,
            text="I",
            **common_label_options
        )
        label_e = tk.Label(
            settings_container,
            text="E",
            **common_label_options
        )
        label_d = tk.Label(
            settings_container,
            text="D",
            **common_label_options
        )

        label_s.pack(side=tk.LEFT, padx=5)
        label_i.pack(side=tk.LEFT, padx=5)
        label_e.pack(side=tk.LEFT, padx=5)
        label_d.pack(side=tk.LEFT, padx=5)

        label_s.bind("<Button-1>", lambda e: self.show_stats())
        label_i.bind("<Button-1>", lambda e: self.app.table_io.import_file())
        label_e.bind("<Button-1>", lambda e: self.app.table_io.export_table())
        label_d.bind("<Button-1>", lambda e: self.show_datatype_dialog())

        def on_label_enter(event):
            event.widget.config(bg=self.colors["button_selected"])

        def on_label_leave(event):
            event.widget.config(bg=self.colors["background"])

        labels = [label_s, label_i, label_e, label_d]

        for label in labels:
            label.bind("<Enter>", on_label_enter)
            label.bind("<Leave>", on_label_leave)

    def _setup_lower_section(self, parent: tk.Frame) -> None:
        self.lower_header_frame = create_frame(parent=parent, width=None, bg=self.colors["background"])
        self.lower_header_frame.grid(row=1, column=0, columnspan=5, sticky="ew")

    def show_stats(self):
        """Display stats about the boolean columns in a menu-like popup with a table."""
        table_name = self.app.current_table_name
        if not table_name:
            messagebox.showwarning("No Table Selected", "Please select a table to view stats.")
            return

        if not self.app.current_sheet:
            messagebox.showwarning("No Data", "No data available to show stats.")
            return

        data = self.app.current_sheet.get_sheet_data()
        current_headers = self.app.current_sheet.headers()
        data_types = self.app.data_manager.tables_data[table_name].get("data_types", [])

        while len(data_types) < len(current_headers):
            data_types.append('string')

        total_rows = len(data)
        boolean_columns = []
        for col_idx, dtype in enumerate(data_types):
            if dtype == 'boolean':
                header = current_headers[col_idx]
                # Handle None values and convert to booleans
                column_data = [bool(row[col_idx]) if row[col_idx] is not None else False for row in data]
                true_count = sum(1 for val in column_data if val is True)
                false_count = sum(1 for val in column_data if val is False)
                boolean_columns.append((header, true_count, false_count))

        # Create a custom popup window that looks like a menu
        if hasattr(self, 'stats_popup') and self.stats_popup.winfo_exists():
            self.stats_popup.destroy()  # Destroy if already exists to prevent multiple popups

        self.stats_popup = tk.Toplevel(self.root)
        self.stats_popup.overrideredirect(True)  # Remove window decorations
        self.stats_popup.config(bg=self.colors["background"])

        # Add a border to mimic the menu style
        border_width = 1
        border_color = self.colors.get("menu_border", "black")  # Use your menu border color
        self.stats_popup.config(highlightthickness=border_width, highlightbackground=border_color)

        # Position the popup at the mouse location
        menu_x = self.root.winfo_pointerx()
        menu_y = self.root.winfo_pointery()
        self.stats_popup.geometry(f"+{menu_x}+{menu_y}")

        # Create a frame to hold the content
        content_frame = tk.Frame(self.stats_popup, bg=self.colors["background"])
        content_frame.pack(padx=5, pady=5)

        # Add the total rows label
        total_label = tk.Label(content_frame, text=f"Total: {total_rows}",
                               bg=self.colors["background"], fg=self.colors["text"],
                               font=self.fonts["text"])
        total_label.pack(pady=(0, 5), anchor='center')

        # Add a separator line
        separator = tk.Frame(content_frame, bg=self.colors["header_info"], height=1)
        separator.pack(fill=tk.X, pady=(0, 5))

        if boolean_columns:
            # Create a frame to hold the table
            table_frame = tk.Frame(content_frame, bg=self.colors["background"])
            table_frame.pack()

            # Set up column headers
            headers = ["Column", "True", "False"]
            for col_num, header_text in enumerate(headers):
                header_label = tk.Label(table_frame, text=header_text, bg=self.colors["background"],
                                        fg=self.colors["text"], font=self.fonts["text"])
                header_label.grid(row=0, column=col_num, padx=10, pady=2, sticky='w')

            # Populate the table with stats data
            for row_num, (header, true_count, false_count) in enumerate(boolean_columns, start=1):
                header_label = tk.Label(table_frame, text=header, bg=self.colors["background"],
                                        fg=self.colors["header_info"], font=self.fonts["text"])
                header_label.grid(row=row_num, column=0, padx=10, pady=2, sticky='w')

                true_label = tk.Label(table_frame, text=str(true_count), bg=self.colors["background"],
                                      fg=self.colors["header_info"], font=self.fonts["text"])
                true_label.grid(row=row_num, column=1, padx=10, pady=2, sticky='w')

                false_label = tk.Label(table_frame, text=str(false_count), bg=self.colors["background"],
                                       fg=self.colors["header_info"], font=self.fonts["text"])
                false_label.grid(row=row_num, column=2, padx=10, pady=2, sticky='w')

            # Configure grid weights for proper alignment
            for col_num in range(3):
                table_frame.grid_columnconfigure(col_num, weight=1)
        else:
            # Display a message when there are no boolean columns
            no_data_label = tk.Label(content_frame, text="No boolean columns to display.",
                                     bg=self.colors["background"], fg=self.colors["text"],
                                     font=self.fonts["text"])
            no_data_label.pack(pady=10)

        # Bind events to close the popup when clicking outside or pressing Escape
        def close_popup(event=None):
            if self.stats_popup.winfo_exists():
                self.stats_popup.destroy()
                # Unbind the click event from the root window
                self.root.unbind("<Button-1>", self.click_outside_popup)
                self.root.unbind("<Configure>", self.window_resized)

        # Close the popup when clicking outside
        def click_outside_popup(event):
            if event.widget not in self.stats_popup.winfo_children():
                close_popup()

        self.click_outside_popup = self.root.bind("<Button-1>", click_outside_popup)
        # Bind to root window resizing to reposition popup if necessary
        self.window_resized = self.root.bind("<Configure>", lambda e: close_popup())

        self.stats_popup.bind("<FocusOut>", close_popup)
        self.stats_popup.bind("<Escape>", close_popup)

        # Bring the popup to focus so it can detect FocusOut event
        self.stats_popup.focus_force()

    def update_true_counter(self, count_text: str) -> None:
        pass

    def show_datatype_dialog(self) -> None:
        """Show custom popup window for changing column data types."""
        table_name = self.app.current_table_name
        if not table_name:
            messagebox.showwarning("No Table Selected", "Please select a table to change datatypes.")
            return
    
        current_headers = self.app.current_sheet.headers() if self.app.current_sheet else []
        self.app.data_manager.headers[table_name] = current_headers
        self.data_types = self.app.data_manager.tables_data[table_name].get("data_types", []).copy()
    
        while len(self.data_types) < len(current_headers):
            self.data_types.append('string')
    
        # Create a custom popup window that looks like a menu
        if hasattr(self, 'datatype_popup') and self.datatype_popup.winfo_exists():
            self.datatype_popup.destroy()  # Destroy if already exists to prevent multiple popups
    
        self.datatype_popup = tk.Toplevel(self.root)
        self.datatype_popup.overrideredirect(True)  # Remove window decorations
        self.datatype_popup.config(bg=self.colors["background"])
    
        # Add a border to mimic the menu style
        border_width = 1
        border_color = self.colors.get("menu_border", "black")  # Use your menu border color
        self.datatype_popup.config(highlightthickness=border_width, highlightbackground=border_color)
    
        # Position the popup at the mouse location
        menu_x = self.root.winfo_pointerx()
        menu_y = self.root.winfo_pointery()
        self.datatype_popup.geometry(f"+{menu_x}+{menu_y}")
    
        # Create a frame to hold the content
        content_frame = tk.Frame(self.datatype_popup, bg=self.colors["background"])
        content_frame.pack(padx=5, pady=5)
    
        # For each header, create a label and an OptionMenu for data type selection
        self.datatype_vars = {}  # To store the selected data types
        for header_index, header in enumerate(current_headers):
            current_type = self.data_types[header_index]
            frame = tk.Frame(content_frame, bg=self.colors["background"])
            frame.pack(fill=tk.X, pady=2)
    
            header_label = tk.Label(frame, text=f"{header}:", bg=self.colors["background"],
                                    fg=self.colors["text"], font=self.fonts["text"])
            header_label.pack(side=tk.LEFT)
    
            var = tk.StringVar(value=current_type)
            option_menu = tk.OptionMenu(frame, var, *self.DATA_TYPE_OPTIONS)
            option_menu.config(bg=self.colors["background"], fg=self.colors["text"],
                               highlightthickness=0, relief=tk.FLAT)
            option_menu["menu"].config(bg=self.colors["background"], fg=self.colors["text"])
            option_menu.pack(side=tk.RIGHT)
            self.datatype_vars[header] = var  # Store the variable
    
        # Add a separator line
        separator = tk.Frame(content_frame, bg=self.colors["header_info"], height=1)
        separator.pack(fill=tk.X, pady=(5, 5))
    
        # Add Apply Changes label acting as a button without click effect
        apply_label = tk.Label(
            content_frame,
            text="Apply Changes",
            bg=self.colors["background"],
            fg=self.colors["text"],
            font=self.fonts["text"],
            cursor="hand2"  # Change cursor to hand to indicate it's clickable
        )
        apply_label.pack()
    
        # Bind click event to the label
        apply_label.bind("<Button-1>", lambda e: self._apply_changes())
    
        # Add hover effects to match other labels (Optional)
        def on_label_enter(event):
            event.widget.config(bg=self.colors["button_selected"])
    
        def on_label_leave(event):
            event.widget.config(bg=self.colors["background"])
    
        apply_label.bind("<Enter>", on_label_enter)
        apply_label.bind("<Leave>", on_label_leave)
    
        # Bind events to close the popup when clicking outside or pressing Escape
        def close_popup(event=None):
            if self.datatype_popup.winfo_exists():
                self.datatype_popup.destroy()
                # Unbind the click event from the root window
                self.root.unbind("<Button-1>", self.click_outside_popup)
                self.root.unbind("<Configure>", self.window_resized)
    
        # Close the popup when clicking outside
        def click_outside_popup(event):
            if self.datatype_popup and not str(event.widget).startswith(str(self.datatype_popup)):
                close_popup()
    
        self.click_outside_popup = self.root.bind("<Button-1>", click_outside_popup)
        # Bind to root window resizing to reposition popup if necessary
        self.window_resized = self.root.bind("<Configure>", lambda e: close_popup())
    
        self.datatype_popup.bind("<FocusOut>", close_popup)
        self.datatype_popup.bind("<Escape>", close_popup)
    
        # Bring the popup to focus so it can detect FocusOut event
        self.datatype_popup.focus_force()

    def _apply_changes(self) -> None:
        """Apply the datatype changes and update the table."""
        table_name = self.app.current_table_name
        current_headers = self.app.current_sheet.headers() if self.app.current_sheet else []
        self.data_types = []

        for header in current_headers:
            dtype = self.datatype_vars[header].get()
            self.data_types.append(dtype)

        self.app.data_manager.tables_data[table_name]["data_types"] = self.data_types
        self.app.data_manager.save_data()
        self.app.table_display.apply_column_data_types(self.data_types)
        self.app.table_display.process_and_save_current_sheet_data()
        self.app.refresh_table()
        if hasattr(self, 'datatype_popup') and self.datatype_popup.winfo_exists():
            self.datatype_popup.destroy()