Yes, I know you said that before. But I am not asking you to turn it off, I am asking you to delete it, so the only things in your scene are your sprites. There is not a way to “Turn off” lighting. You can reduce the luminosity to 0 but it’s still ON, if that makes sense. Also when you run the game in the viewport anything that is hidden in the world outliner still shows up, it’s only hidden in the editor (that’s for when there’s 2000 things in the scene and you can’t see).
And what about overriding the auto-exposure?