To be more specific, what happens is that the screen goes all black when you press the "F" key (or Y on the controller). From the screenshots, it seems it would have this cool effect with outlines and whatnot, but in my end it's all black.
If useful:
GPU: Radeon 6950 XT
Tested on: 1400p monitor
Distro: Arch Linux
Driver: Open source RADV driver