This is related to my other question: Kate has no window borders, and thus no minimize, maximize, and close buttons
In KDE, after right-clickin on any window border, or it's entry in the task manager, I can select More Actions
and then Fullscreen
.
Once in this mode, normal window manager commands such as alt-tab and alt-f4 no longer work. Moreover, the task bar and everything else remain permanently hidden until I quit the window via the File
menu.