https://i.imgur.com/4YJItiF.png - Current (Even with the chatbox collapsed, the video is planted right center of the screen.)
https://i.imgur.com/IKcHYeN.jpg - Proposed
Recently bought a monitor that has vertical support and whilst viewing a stream, noticed that even in theater mode, the stream itself was pretty small on the left hand side with a tall chatbox on the left. I had to pop out the chatbox and rearrange windows to get it to look like how it looks in the propsed image.
Just a suggestion!