I just did this today, and on my 2017 I pushed jack mode and waited a bit, then got out and jacked it up. I just swapped 20" to 20", so not sure about adjusting down from 22 to 20.
Jack mode was in the service section, and when I when to the suspension section after pushing the jack button, it said I could not adjust anything while in jack mode...so thinking you just hit the button, and go jack it up.