Setting the window size/resolution - What are the right ways?

[DigitalGreenTea]

Hi, I am very confused about how to set the window resolution of my Unreal Engine project when I launch it in standalone mode. For testing purposes, I want it to be X:1080 and Y:1920 (like Portrait on Mobile). What I’ve already tried:
Get the game user settings in my game mode, set the resolution and apply the settings (C++ and Blueprints, doesn’t seem to work in either case, it’s always 720p 16:9).
starting the standalone game with -game -windowed -ResX=1080 -ResY=1920
and creating a DefaultUserGameSettings.ini in my configuration folder.

It could be that the plugin “AsyncLoadingScreen” is messing up the settings - to narrow down my problem, is this the usual procedure to change the window size of a standalone game?

[ClockworkOcean]

What is actually happening?

[DigitalGreenTea]

Hi, the game always seems to start at 1280x720 resolution instead of the 9:16 1920x1080 resolution I intended.
I found that in a fresh Unreal project my methods above work, sorry. It seems that the plugin does not support this type of resolution. My problem is therefore closed.