Way to control screen shape

[Serentty]

Right now it defaults to adding letterboxing on one side of my screen in order to avoid the camera cutout, but not on the other side. This means I get a straight edge on one side but a rounded edge (because of my screen’s rounded edges) on the other.

I think it would be nice to have some way to control the shape of the image, such that either it uses the entire screen, or lets me letterbox enough on both sides to get a perfectly rectangular image (ideally the latter).

Here is a screenshot of what I am talking about. The letterboxing on the left side is visible, but obviously not the screen rounding on the right, because that is a product of the physical display.