Final Update

import tkinter as tk
import tkinter.ttk as ttk


lorem_ipsum = 'Lorem ipsum dolor sit amet, luctus non. Litora viverra ligula'


class Scrollbar(ttk.Scrollbar):
    def __init__(self, parent, canvas, **kwargs):
        ttk.Scrollbar.__init__(self, parent, **kwargs)

        command = canvas.xview if kwargs.get('orient', tk.VERTICAL) == tk.HORIZONTAL else canvas.yview
        self.configure(command=command)

    def set(self, low, high):
        if float(low) > 0 or float(high) < 1:
            self.grid()
        else:
            self.grid_remove()

        ttk.Scrollbar.set(self, low, high)


class App(tk.Tk):
    def __init__(self):
        super().__init__()
        self.rowconfigure(0, weight=1)
        self.columnconfigure(0, weight=1)
        self.title('Paned Window Demo')
        self.geometry('420x200')

        style = ttk.Style()
        style.theme_use('clam')
        style.configure('TPanedwindow', background='black')

        pw = ttk.PanedWindow(self, orient=tk.HORIZONTAL)
        left_frame = ttk.Frame(pw)
        right_frame = ttk.Frame(pw)

        ttk.Label(left_frame, text='Left Pane').grid()
        left_frame.rowconfigure(0, weight=1)
        left_frame.columnconfigure(0, weight=1)
        left_frame.grid(sticky=tk.NSEW)

        right_frame.rowconfigure(0, weight=1)
        right_frame.columnconfigure(0, weight=1)
        right_frame.grid(sticky=tk.NSEW)

        pw.add(left_frame)
        pw.add(right_frame)
        pw.grid(sticky=tk.NSEW)

        canvas = tk.Canvas(right_frame, bg=style.lookup('TFrame', 'background'))
        canvas.frame = ttk.Frame(canvas)
        canvas.rowconfigure(0, weight=1)
        canvas.columnconfigure(0, weight=1)
        canvas.grid(sticky=tk.NSEW)
        canvas.frame.rowconfigure(990, weight=1)
        canvas.frame.columnconfigure(0, weight=1)
        canvas.frame.grid(sticky=tk.NSEW)

        content = ttk.Frame(canvas.frame)
        content.rowconfigure(0, weight=1)
        content.columnconfigure(0, weight=1)
        content.grid(sticky=tk.NSEW)

        xscroll = Scrollbar(right_frame, canvas, orient=tk.HORIZONTAL)
        yscroll = Scrollbar(right_frame, canvas, orient=tk.VERTICAL)
        xscroll.grid(row=990, column=0, sticky=tk.EW)
        yscroll.grid(row=0, column=990, sticky=tk.NS)

        for idx in range(1, 11):
            tk.Label(content, bg='#aaaaaa', fg='#000000', text=f'{idx} {lorem_ipsum}').grid(sticky=tk.NW)

        ttk.Separator(content, orient=tk.HORIZONTAL).grid(pady=10, sticky=tk.EW)

        for idx in range(11, 21):
            tk.Label(content, bg='#aaaaaa', fg='#000000', text=f'{idx} {lorem_ipsum}').grid(sticky=tk.NW)

        self.window = canvas.create_window((0, 0), window=canvas.frame, anchor=tk.NW)

        self.update_idletasks()
        pw.sashpos(0, newpos=100)

        def update_canvas(e):
            _, _, width, height = content.bbox(tk.ALL)
            if width > e.width or height > e.height and not self.window:
                self.window = canvas.create_window((0, 0), window=canvas.frame, anchor=tk.NW)
            else:
                canvas.delete(self.window)
                canvas.frame.grid()
                self.window = None
        canvas.bind('<Configure>', update_canvas)

        canvas.configure(scrollregion=content.bbox(tk.ALL))
        canvas.configure(xscrollcommand=xscroll.set, yscrollcommand=yscroll.set)


def main():
    app = App()
    app.mainloop()


if __name__ == '__main__':
    main()