Did I mention I wasn’t sure whether it was showing up on camera??? Also, not sure why I repeated myself about liking the placement of some nose redness, I must have thought the background noise would be too loud the first time.
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