Any notice the “APPS” for the marketplace is missing from their Infotainment screen? Is there a way to download it or add it? I have a 2020 SLT.

Hi All - New the forum. Recently purchase pre-owned 2015 SLE Acadia in need of interior improvements. I really want to replace the main screen (Infotainment System). Anyone have suggestions for that? What sites do you use?