It would be great if when a user is sharing their screen during a video call, the list of participants and their small video feeds were shown above the shared content rather than below it. Many times people are looking at themselves or other participants when speaking, and it looks to others like their eyes are closed. By moving the user's own image and the images of others to the top of the screen, above the shared content, there's a better likelihood that users will be looking upwards towards the camera rather than down.