KivyMD is a collection of Material Design compliant widgets for use with Kivy, a framework for cross-platform, touch-enabled graphical applications. https://youtube.com/c/KivyMD https://twitter.com/KivyMD https://habr.com/ru/users/kivymd https://stackoverflow.com/tags/kivymd
Fix the examples in the documentation for the ToggleButton module https://kivymd.readthedocs.io/en/latest/behaviors/togglebutton/