In our 2015 centre screen menu...
Settings
Safety and Driving Assistance
Parksense Front Volume lo/med/high
Parksense Rear Volume lo/med/high
Plus rearview camera settings as well
and there is the Parksense "off" button below the screen
John
and if you haven't already accessed this site - here's hours of happy reading for you - remember though that here in Aus we get a special "export" version of all models with goodies that are not standard in the US.
http://www.wk2jeeps.com/wk2menu.htm