Keyboard Fn Function key switchUsing language Using Macbook Air M1. The keyboard Fn (Function) key has a globe icon to switch between languages. It works but a bit quirky. When it's not working, it tries to switch language but couldn't, and when I switch screen, the language switching dialog keeps popping up.
To make the keyboard Fn key work again in switching language, I have to restart my computer. See video attached - the Fn key is not even pressed.
Using Fn to switch keyboards is new with Big Sur.  Buggy behavior has been reported by many users in the Apple discussion forums.  Until Apple fixes it, probably best to use the traditional shortcuts found in System Preferences/Keyboard/Shortcuts.
I understand MacOS 11.2 should fix this problem when released.