Save graphical user setting

Hi . I have two major question . first is when I’m saving resolution in (GameUserSettings.ini) I can’t get it back from it .
It bring back game view port settings from Editor Preference (LastUserConfirmedDesiredScreen) not (LastUserConfirmedResolution) . second is how can I save things or load thing in (GameUserSettings.ini) other than get or set GameUserSettings let me ?

[/Script/Engine.GameUserSettings]
bUseVSync=False
bUseDynamicResolution=False
ResolutionSizeX=1920
ResolutionSizeY=1080
LastUserConfirmedResolutionSizeX=1920
LastUserConfirmedResolutionSizeY=1080
WindowPosX=-1
WindowPosY=-1
FullscreenMode=1
LastConfirmedFullscreenMode=1
PreferredFullscreenMode=1
Version=5
AudioQualityLevel=0
LastConfirmedAudioQualityLevel=0
FrameRateLimit=0.000000
DesiredScreenWidth=1280
bUseDesiredScreenHeight=False
DesiredScreenHeight=720
LastUserConfirmedDesiredScreenWidth=1270
LastUserConfirmedDesiredScreenHeight=720
LastRecommendedScreenWidth=-1.000000
LastRecommendedScreenHeight=-1.000000
LastCPUBenchmarkResult=-1.000000
LastGPUBenchmarkResult=-1.000000
LastGPUBenchmarkMultiplier=1.000000
bUseHDRDisplayOutput=False
HDRDisplayOutputNits=1000