The system menu is provided by the window manager, not by VLC.
On KDE, you can reach the system menu with Alt+F3. Then you can disable full screen mode from Advanced -> Full screen mode. The procedure depends on your window manager.
The system menu is provided by the window manager, not by VLC.
On KDE, you can reach the system menu with Alt+F3. Then you can disable full screen mode from Advanced -> Full screen mode. The procedure depends on your window manager.