There are 2 push button switches connected to wires in the upper left hand corner of the front cabinets.
I don't remember the sequence to program them for the travel of the shades, but they control the distance up and down for both shades.
Check out the MCD website
RV Roller Shades | MCD Innovations and you should be able to get the correct instructions.
Hope this helps,
Oops, forgot to add, that if the ignition is "on" it will limit the travel of the block out shade