Allows the user to quickly hide all camera windows. Useful for trying to watch videos in video players on screen so they're not obscured by top/bottom videos.
Instead of making people scroll out in the browser, just give them the option to shut off the video UI elements.
For others around them, they would still see the person's video screen with the Topi in it, and a message indicating that the user can not see/hear.
As world builders seek to have live video in players, it's important that people can view them in an unobstructed way. If this suggestion isn't a great one - please provide alternatives as responses.