I have Microsoft Edge to thank (due to split screen) for showing me when the YouTube Music site is in a smol inaff window, it morphs into the mobile version. Works in other browsers-pri.
P.S. If you do this in split screen and exit split screen without changing the size back so it goes back to desktop version, a lot of buttons on the site disappear. Can be fixed by going back and doing what I just said I didn't do-pri.
