What's the proper way to handle the notch in simple fullscreen mode?

I can think of 3 different types of apps:

1. apps that want to use the area to the sides of the notch
2. apps that don't want to use the area to the sides of the notch and prefer to just have the simple fullscreen window sit below the notch, and have...
   2a) the area above the window filled by black or some other color.
   2b) the area to the sides of the notch should continue to show the titlebar.

Is this something apps should handle or maybe glutin can abstract that away?