Keyboard Key to toggle Contents Pane Open / Close

I commonly find myself battling Anaplan for screen real estate to see what I want when I want it, and NOT when I don't want to see it.  One of the culprits is the Contents Pane, and another as a model builder is the dashboard editing panel or the settings tab.  When the Contents Pane is open and one of these others as well, the amount of useable screen is pretty small.  

As bad as it may sound, it is not uncommon to find myself working in this tiny little box before realizing I could close the Contents Pane and have a much larger work area.  I believe having a hotkey to toggle the Contents Pane open / close would be a really helpful addition to Anaplan, so I don't have to take my mouse off what I'm doing to go click it.