Major graphical error in Viewport during playback

[SirStarshine]

I’m new to EU4, and I developed an issue a couple of weeks ago that I’ve never seen before. When I hit Play, with “Simulate” active, the view goes completely pixelated, as shown in the picture.
However, if “Standalone Game” is active, the visual quality is perfectly fine. Also, the pixelation is not a problem during editing, only in playtesting.
I’ve even uninstalled UE4 and reinstalled the newest version, but the problem persists. And as far as I know, no settings have been changed.

Any help is greatly appreciated.

[darthviper107]

The engine tries to adjust the graphics settings based off your hardware: Scalability Reference | Unreal Engine Documentation

[MikeRPG]

Change the engine scalability settings from auto under settings>engine scalability settings in the main window (the 3 cogs settings button at the top)