Exactly. So I went through settings in my 2016 and I can't find it. I guess I keep lookingThe door unlock options are in the settings of the truck. At least on the 2015 you can choose between driver door or all doors, and you can choose lights/horn etc. as the signal.
I don't think GMC has the window close feature. I had a 2015 VW Golf which is essentially an Audi A3 and it had that feature which was very nice.
The lack of a proximity sensor / push button start is what I miss the most.