You can define your own custom shortcuts. Go to Settings > Window Manager > Keyboard (tab) and look for “Maximize Window” under “Action” column, select it and click “edit”.

Super key is an alternative and older name for what is commonly labelled as the Windows key or Command key on modern keyboards, typically bound and handled as such by Linux and BSD operating systems and software today. {Taken from wikipedia [[https://en.wikipedia.org/wiki/Super_key_(keyboard_button)|Super key (keyboard button)}