Linux & PiP (Picture in Picture) - Always on Top

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Hi there,

Is it Freetube or the Linus distro that determine this issue? I'm using PopOS (distro) and when I use the PiP feature the screen is not Always on Top, it get overlap by other program.

Is it because Freetube PiP not support Linux to be always on top? Or it because the PopOS/Linux doesn't support Always on Top, I can use a Shortcut to force the window to be On Top but it will be bugged when I play a different video.

Anyone having issue using PiP with Linux?

I'm a Windows user and there is no issue here, want to give Linux a try.