It's no surprise what happens in the back row of the classroom. There was a small stye on my eye, which caused my eyeshadow not to fade, but it shouldn't be obvious hahaha
To listen while using other apps, switch the player to Picture-in-Picture (PiP) during playback — it keeps playing in a small floating window (the screen stays on).
To listen with the screen fully off, in-browser playback stops by YouTube's design. Open the video in the YouTube app to keep listening where background playback is supported (e.g. with YouTube Premium).
Open in YouTube app