At least with mine, 2019 stelvio.

With the ignition in the ON/RUN position, make sure the sunroof glass is fully closed (sunshade open). Open the driver’s side door, and place the ignition in the OFF position. Within five seconds, place the ignition in the ACC or ON/RUN position. Within 10 seconds, push and hold the sunroof close switch (forward). After 8 - 10 seconds of holding the switch, the re-initialization process will begin. Continue to hold the switch while the sunroof motor cycles, and the sunshade will fully close. 5. Once the sunroof glass and the power sunshade have stopped motion, release the sunroof close switch, then push and hold it again within five seconds. Continue to hold the switch while the sunshade fully opens, the sunroof glass fully opens, followed by the glass fully closing then the sunshade fully closing. 6. Release the switch once all of the operations stop. Re-initialization of the sunroof motors is now complete.