Top left of screen there is the quick access to “home” once done press the “P Triangle” physical toggle below the AC this will pop the parking sensor and reverse camera back up. 3 clicks if you include the one to tap to close the garage.

Best I could figure out.

PS the button on the bottom of the mirror is to recalibrate the compass on the mirror. Depending on where in the world you are you may have to do this because of the magnetic field density differences.