@TeamYouTube Is it normal that the screen size of youtube videos has biggened? I feel annoyed at it, is it possible to go back to the original size? And no, I'm not on cinema nor full size mode.
We recently updated the video player on desktop to automatically adapt to the shape of the page and provide maximum space for the video. While there's no way to undo the change, please send us feedback via our official feedback tool: https://goo.gl/xAwmTv . Really appreciate it!