Unreal Set the Packaged Game Window resolution

To set the window size in an Unreal Packaged game have these nodes in your Level Blueprint that are called on Event Begin Play:

Then package the game. In the Packaged Game folder Look for YourGameNameFolder/Config/DefaultGameUserSettings.ini

open the DefaultGameUserSettings.ini and edit it like so…

….Adding a custom ResolutionSizeX makes the BP above load and implement this setting. The FullscreenMode=0 . sets it to a  borderless window in the top left of the monitor. IDK how to change the window position yet.

[/Script/Engine.GameUserSettings]
ResolutionSizeX=900
ResolutionSizeY=900
FullscreenMode=0
Version=5