Help with Screen Resolution via gameusersettings.ini UE4

Hello, I’d like to ask if anyone can help me sorting something plaguing me for ages. I have a game installed which runs in UE4. Some parameters I pass in gameusersettings.ini located in C:\Users\username\AppData\Local\Hodzero\Saved\Config\WindowsNoEditor seem to work fine like framratelimit. others like x and y resolution dont. this is my ini:

[ScalabilityGroups]
sg.ResolutionQuality=100.000000
sg.ViewDistanceQuality=2
sg.AntiAliasingQuality=2
sg.ShadowQuality=2
sg.PostProcessQuality=2
sg.TextureQuality=2
sg.EffectsQuality=2
sg.FoliageQuality=2

[/Script/Engine.GameUserSettings]
bUseDesktopResolution=False
bUseVSync=False
ResolutionSizeX=1920
ResolutionSizeY=1080
FullscreenMode=0
FrameRateLimit=120.000000
version=5

If I run the game windowed launches at 1080p in my 1440p desktop res. if I launch FS or alt+enter while windowed it goes into 1440p matching my desktop res. only way i can get it to run at 1080p is changing my desktop res to 1080p and then launch it.

i tried disabling nvidia CP scaling via gpu and cpu and with and without the override option as a side note not sure if it is relevant.

any ideas on what I am missing? thanks in advance.

fullscreenmode 0 is exclusive fullscreen. 2 is windowed with caption and frame. 1 is borderless windowed fullscreen. which you should choose. that allows you to run different resolution then your desktop and the game is “upscaled” by windows’ window manager. i think crrect that’s what you desire?

Using 1 or 0 always displays in 1440p which is my desktop res

you sure about that? i done this hack on jedi survivor, which is ue4 too, btw.

i mean… you can try a lower resolution than 1080p. you should see the difference in rendered resolution. it should look a lil more blurry. dlss, in case you use that, will make it look good tho.

Im using the numbers in the osd reported by afterburner as a visual aid since visually speaking 1440 and 1080 is not that different. They are small ergo 1440p. I just changed the parameters to 720p and ingame the quality didnt change a bit. Its still 1440p. When i change the desktop res to 720p and run the game the visual difference is obvious as everything is blurry. This is a very old game with no dlss. Its an arcade shooter house of the dead scarlet dawn

No matter what i do dam thing always picks up desktop res while in fullscreen. Its like some parameters are taken in like framerate but others are not. I guess the obvious workaround is use ResolutionQuality set to 75 which is 1440x75/100=1080 right? That is effectively the same as running the desktop at 1080?