For the highline without the MFSW, you do indeed use the wiper stalk. The "rocker" on the end of the stalk merely "cycles" through the stored data. There should also be a "reset" button on the bottom of the wiper stalk - get out of the car and get on your knees on the floor to look for it. This resets the stored values to zero, and also turns on and off the display in the MFD.
HTH
