I use Lazarus (1.7), Linux with Qt widgetset. How to go to full-screen mode, and go back after?
Questions about full-screen for C++ don't help here, I need it in Lazarus.
I've not done it but I would give a try to the form's windowstate property.
You can see the possible settings in the object inspector: wsNormal wsMaximized wsMinimized wsFullScreen
May be as simple as setting the windowstate progromatically.