This style forces to use the pre-flexy video size before it first came out in 2018.
Around April 2023, The experimental flag to disable the dynamic player sizing no longer works anymore. So I made this style by myself!
Both of these are required to install here (you need Tampermonkey before you do this)!
YouTube Video Resize Fix Script (It also fixes the video streaming and controls cut off issue):
https://greasyfork.org/en/scripts/457319-youtube-video-resize-fix
Custom Aspect Ratio Userstyle (Make sure you can set it to 16:9):
https://github.com/sapondanaisriwan/AdashimaaTube/blob/master/userstyles/features/custom-aspect-ratio.user.css
