Looks like you're talking about the Picture-in-picture feature. Steps and more info about it here: https://yt.be/help/5zw4
@TeamYouTube has closing the app and still watching the video been removed because every video I've watched hasn't been able to do so and I'm on the latest update and. Haven't messed with settings
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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