Set a non-fullscreen window position

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Hi in my packaged game I’m using a DefaultGameUserSettings.ini like this to give a smaller borderless window. But how do i set the window position? setting WindowPosX=-1 to something else doesn’t do anything. I have a level blueprint that does an Apply Resolution Settings.

[/Script/Engine.GameUserSettings]
 bUseVSync=False
 ResolutionSizeX=1200
 ResolutionSizeY=1200
 LastUserConfirmedResolutionSizeX=1200
 LastUserConfirmedResolutionSizeY=1200
 bUseDesktopResolutionForFullscreen=False
 FullscreenMode=2
 LastConfirmedFullscreenMode=2
 Version=5