On my Compass 2019 23TR, the solar controller is already installed. It is connected to the batteries and ready for panels to be added which I have not done. Our controller is installed on the cabinet to the left of the stairs. Ours is a Go Power.
If you register at
https://www.thormotorcoach.com/owner-resource/ using the VIN of your chassis, you find the manuals for the equipment installed on your specific rig.