1

I want to have one canvas for all my scenes, so when I switch between scenes I can destroy specific UI elements in the canvas. Is this possible?

2

Yes. You can mark the canvas as ‘Dont Destroy on Load’. Then the script managing the UI (which should be on the canvas), turns things on and off with a function of

  void OnSceneLoaded(Scene scene, LoadSceneMode mode)
3

Excellent, got it working as I wanted. Thanks!