Borderless Fullscreen for packaged?

I’ve tried everything, from running console command FULLSCREEN, to r.FullscreenMode 0, to editing the .ini in /Saved, to creating a DefaultUserSettings.ini in Config. I have literally tried everything I could find in the answer section, and I still get a border when running in fullscreen.

I can’t understand how can everything else be so easily accessible in UE4, yet I can’t get the simplest thing to work. Maybe I’m just an idiot, but I’ve literally edited every .ini I could find. I’m lost.

Edit: I’ve established that this is a bug with UMG, I will repost this question as a bug report.

[/Script/Engine.GameUserSettings]
bUseVSync=False
//ResolutionSizeX=2560
//ResolutionSizeY=1440
//LastUserConfirmedResolutionSizeX=2560
//LastUserConfirmedResolutionSizeY=1440
WindowPosX=-1
WindowPosY=-1
bUseDesktopResolutionForFullscreen=True
FullscreenMode=0
LastConfirmedFullscreenMode=0
Version=5

0= True Borderless Fullscreen Mode
1= Windowed Fullscreen
2 =Windowed

You did read what I wrote right? I’ve already tried that in 3 different .ini’s. Also, for this to work, a DefaultUserSettings.ini must be made, which I did and still get a border on the bottom and the right of the screen.