She's sliced! She's diced! She's in 4K, but with subpar audio! She'ssssssss my everyday GRWM! LOL. CLEARLY experienced a nice combo of both audio and video challenges here, but you know what, the content's cute so we're rolling with the punches!
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