This may or may not help for those having full screen issues.

1) Uninstall IWD2

2) Change Input from monitor.
From display port to HDMI

3) Turn on Night light ( thats what caused screen flickering)
Settings>System>Display>Under Color turn on Night light

4) reinstall IWD2

5) install wide screen mod
Set Resolution 1920x1440
( have not tried 2560x1440 yet)

Hope this helps