Replace PySimpleGUI by plain Tkinter
PySimpleGUI is simply not usable for production. It's buggy. Many feature are missing. Alot of API are not symetric.
For these reason, we should move away from PySimpleGUI ans use Tkinter directory with a couple of wrapper arround the widget creation.
Also take a look at CustomTkinter
https://pythonawesome.com/a-wrapper-around-the-python-tkinter-library-for-customizable-and-modern-ui-elements-in-tkinter/
It provide a nice Theme management for Tkinter
Edited by Patrik Dufresne