Android project build

Good afternoon, dear forum members, there are some small problems with the project on android, engine version 5.2.1:

  1. The assembled project does not want to work on androids below 11, although support is from 8 and above.
  2. I can’t start the game in full-screen mode, that is, the place for the curtain is still not used by the game and there is a black stripe.

please help me, I searched the whole Internet and didn’t find an answer