Show/Hide Left Zone - Ctrl/Cmd-Alt-L; Alt-I
Show/Hide Right Zone - Ctrl/Cmd-Alt-R
Show/Hide Lower Zone - Ctrl/Cmd-Alt-E
Show/Hide Transport Zone - Ctrl/Cmd-Alt-T
Show/Hide Left Zone - Ctrl/Cmd-Alt-L; Alt-I
Show/Hide Right Zone - Ctrl/Cmd-Alt-R
Show/Hide Lower Zone - Ctrl/Cmd-Alt-E
Show/Hide Transport Zone - Ctrl/Cmd-Alt-T