Fun fact of the day: Microsoft’s graphics technology for games is called DirectX, and the original Xbox console was internally nicknamed the “DirectX Box.” That eventually became Xbox. Released in 2001, the original Xbox was famously bulky and people joked it looked like a small PC tower. It was big because it basically had a gaming PC inside!!
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