I am surely not the only one with this problem.
I have a laptop with a 4k display. In order to see text on the display clearly I have set the scaling to 125%.
I don't know why Warhammer a problem with that but as you can see here https://neocoregames.com/en/community/hub/performance-tweaks-amp-fixes-megathread not all resolutions are available when you are using scaling.
If you are going on a mission and text is shown you will see only the lower part.
In the quest boxes to the right only the first line is visible or even worse the lines are stapleded over each other and you can't make out a thing.
Please make sure that Warhammer ignores the scaling choices in Windows