Note: I'm not mad or overreacting. I'm just redoing the Vegemite bit because a lot of people said that I used too much in the food tasting video. Y'all haven't been around me in real life, so it's understandable that you think I'm getting upset. I'm really not. This is just my personality.
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