I'm running through Prismlauncher on EndeavourOS / x11 on a laptop with a discreet Nvidia card.

The title says the issue - tooltip says this setting is only available on Windows operating systems. However, when I press Shift-P to get to the old settings menu, I can change my resolution from 4k to 1080p with zero issues, either visually or functionally. Alt-tabbing also automatically restores desktop resolution to 4k in other apps, and returns to 1080p when returning to the game.

Is there any reason this function can't pass through the same functionality that the vanilla settings menu has so folks with 4k laptops and weak GPUs on linux can drop to a faster resolution? Even if there were some reason to add a warning about unexpected results (due to no testing on Linux or something), it anecdotally works fine and doesn't seem to need to be hidden behind the vanilla settings menu.

This behavior comes from Sodium, not us — so the fullscreen resolution option being unavailable is outside our control. You might want to bring this up on the Sodium issue tracker instead.

Ref: I'm running ArchLinux using PrismLauncher with only Sodium