[THEBERBSTER]

Hi Shaefer
Welcome back, good to have you around again.
TWoS now comes with a new aspect ratio of 21x9 in the latest 2.2.7 version.

Check that your gpu is setup correctly here.
Post #239 Changing The Nvidia GPU Settings > Essential Settings > Pictorial > Missing pictures replaced

This might be worth taking a look at!
Post #412 Override High DPI Scaling Behavior > Pictorial > Missing pictures replaced

Another answer may be here from C:\Documents\SH5\data\cfg\main cfg
[VIDEO]
AntialiasingLevel=0 ; 0=none, 1=non-maskable, 2=2x, 4=4x, ...
;Resolution=1024,768,60,22; commented so, at first, it starts with the desktop resolution (on release version)
FullScreen=Yes
;Synchronized=Yes

My resolution is 1920,1080,60 the 22 never changes The video setting here is still showing the old 4.3 aspect ratio.
It would be worth looking whether the Synchronized should be set to =no so worth checking out.
These settings are duplicated in the main game folder


You might find this useful.
How to Fix 2560x1440 Errors > Download Tool

Don't have an answer I am afraid but just a few suggestions to be getting on with is better than nothing, so hopefully someone will definitely know and help you.
Peter