I want to record some video tutorials with record desktop and webcam .
and open webcam with mpv player with this command :
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For an one-time application, you can right-click the window title bar, and select "More Actions > No Border".
If you want a particular program's window to always be borderless, you could go to System Settings -> Window Management -> Window Rules, and define a rule that will automatically make that window borderless anytime the window is created.