Full screen of right side panel still shows open left side panel

When the left side panel is open and the full screen mode of the right side panel is activated, the left side panel remains open. So that is not as much "full" as you might want to get. On top of that the top bar butttons of the channel disappeared so you cannot quickly close the left side panel anymore, you have to leave full screen, close the left side panel and then go back to full screen mode.

Solution: full screen of the right side panel should also overlap the left side panel (or close it and reopen it again when full screen mode is exited).