I felt a bit off today and I hope it isn't too obvious in the video I tried my best to make a good video but ended up having to make more edits than I'd like... I sowwy ಥ╭╮ಥ
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