What is a "Scene" exactly?
If you're a teacher and you're going through a PDF exercise opened on your screen while drawing things on a whiteboard behind you, you may want to have 2 scenes:
* One with the opened PDF in full screen, with your camera feed in the bottom-right of the video, in small.
* One with the camera feed in full screen, where viewers can clearly see what you're writing
You'd then be able to switch between those 2 scenes at will depending on what you're currently doing. You'd show the first scene when you're reading the exercise out loud and then switch to the second scene when you're resolving it on the whiteboard.