Why some values are greyed out in project settings?

Hello. I dont know why these values are greyed out, I want to customize the player contrtoller class, anybody? Thanks in advance

I checked the level too, but anything is locked

Hello! Are you using C++ class or BP as Default GameMode?

In the first screenshot you can see I´m using ShooterGame_FreeForAll as Default Game Mode, but this value was already like that in the original project ShooterGame

You can try to create BP around ShooterGame_FreeForAll and use it as default…