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Turns out, there is a "Homing" button hidden in the settings menu. Click on the cog wheel in the left sidebar of the touch screen to go to the settings page: Once in the settings menu, there is...
#1: Initial revision
Turns out, there is a "Homing" button hidden in the settings menu. Click on the cog wheel in the left sidebar of the touch screen to go to the settings page:  Once in the settings menu, there is the homing button on the lower left, which looks approximately like this:  This will move the base plate all the way to the bottom.