If you find it is too quiet, I suggest using headphones Whispering, page turning, writing, typing, and a little bit of tapping. I help a student look at their university course options and help decide which degree is best for them.
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