an uninvited guest participates in this vid in the beginning, so pardon that (apologies)! vid includes pencil sounds, marker sounds, pencil/marker tapping, measuring tape sounds, whispered & soft spoken speech, etc. enjoy :)
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