If you have the BimmerCode app...you don't have to search far to find it...it is one of the "easy" coding parameters...and should be listed on the "supported coding" options listed on their web page...which also gives the control module that you'd need to go into to code it.
Here's a direct link to the BimmerCodeapp.com website coding options for the f15 X5:
https://www.bimmercode.app/cars/f15/
EDIT: Under the MIRRORS heading...this is what it says: