Certain Games Not Stretching to Fullscreen

Hello, I have been looking around for a solution to this issue but can’t seem to find one. Certain games don’t want to stretch to fullscreen when alt+enter or another to enter fullscreen. My issues in particular, games will “enter” fullscreen, but the actual game has not increased in scale but is instead sitting in the top left corner of the screen while everything else is black.

What is your Linux distribution and version?
Is SDL2-compat package installed?

I am using CachyOS (6.15.2-2-cachyos (64-bit)), and I do not believe that package is installed.

Edit: nvm I do have sdl2 installed.

Your answer is not enough accurate.
CachyOS is a Arch based Linux distribution right?
So could you copy/paste result of this command:
pacman -Qs sdl3

pacman -Qs sdl3
local/lib32-sdl2-compat 2.32.56-1
An SDL2 compatibility layer that uses SDL3 behind the scenes - 32-bit
local/lib32-sdl3 3.2.16-1
A library for portable low-level access to a video framebuffer, audio output, mouse, and keyboard (Version
3) - 32-bit
local/sdl2-compat 2.32.56-1.1
An SDL2 compatibility layer that uses SDL3 behind the scenes
local/sdl3 3.2.16-1.1
A library for portable low-level access to a video framebuffer, audio output, mouse, and keyboard (Version
3)

You have the same SDL3/SDL2-compat packages as me and the same issue, it could be related to a sdl3 bug:

Should be fixed in next SDL3 version, cross fingers.

Ah ok. I’ve been seeing this issue in a few other PCs I have CachyOS on, running via Steam using Proton doesn’t seem to fix the issue either. Only a select few games seem to have this issue though thankfully. Thanks for the info!