I just realized that it's possible for companies (e.g. Xiaomi, OnePlus) to include their own special features to their android phones.
My Xiaomi Mi 9T Pro has some special features include (GameTurbo, Floating window, etc.), but the company only provides one way to use it, obviously, there are many different phones that come with special features. My question is, do Stack Exchange sites have any site for using/developing those features?
I already have a question about my phone's special features, but I didn't find any Stack Exchange site, that is specific to ask that kind of question.