The elevation package does not have sensors on the back of the truck to alert you.
The 2nd view is for after you get close to the trailer. You then hit the 2nd view to show you the hitch. You can then pretty much put the ball right into the receiver of the trailer without have to back up 12 times.
https://www.amazon.com/Custom-1999-2006-Chevrolet-Silverado-Sierra,Dashboard/dp/B07SQ32CBW
And since you posted in 2019-2021 forum and the request may have been a typo
https://www.dashdesigns.com/i-31650770-2020-gmc-sierra-1500-dash-cover.html
What you want is a Window repair shop who has fixed this issue. The dealer doesn't do the work, They farm it out to an auto glass repair shop. If you read through the thread you will quickly see what we have experienced. First step never works. 2nd, 3rd and 4th should fix it but keep an eye on it as it has led to 5th and 6th steps for some.