Basically what other comments suggested. The popup menu that shows every time I move with the cursor and covers part of the screen. Can't be hidden on demand. Shows status I can't see without opening it (and covering part of the screen). Can't change my mute status without opening it (and covering part of the screen) or using a very obscure shortcut.
I am confused. The microphone button is on the bottom bar, is clearly available at all times, and can always be clicked-on.
You are using Google Meet within a browser?