Having your Desktop Environment scaled up to 125% does not correspond to your in-game resolution.
If your resolution is 1920x1080, and you scaled the Desktop up to 125%, 1536x864 will be the maximum allowed resolution. Unless you scale it back down in the Configuration settings of your DE.
Tested this on SteamOS (Linux), KDE Plasma.
Having your Desktop Environment scaled up to 125% does not correspond to your in-game resolution.
If your resolution is 1920x1080, and you scaled the Desktop up to 125%, 1536x864 will be the maximum allowed resolution. Unless you scale it back down in the Configuration settings of your DE.
Tested this on SteamOS (Linux), KDE Plasma.