It says in the manual that the car will lock and mirrors will fold when you walk away from the car. Has anyone tried this. It works fine when I lock the doors at the door or use the fob. (I have a 2020 CT5 premium luxury with the platinum package)
Mine did that automatically when I first got it last February. I didn’t like it so I dug into the “vehicle” settings menu and found a way to disable it. So my guess is that yours is disabled and you’ll need to re-enable it in the settings menu.
Good luck! I think the new “infotainment” interface is better than CUE, but still is not always intuitive to use.