losefullscreen

By default in dwm it is possible to make an application fullscreen, then use the focusstack keybindings to focus on other windows beneath the current window (or open a new terminal behind the scenes).

This can leave you in a situation where it is not obvious how to get back to the fullscreen window up front in order to exit fullscreen.

There exists a patch alwaysfullscreen that aims to avoid this by disallowing another client to be focused while a fullscreen window exists.