Can't get windows 11 to scale down display to 100%

Using Display Settings I try to turn off custom scaling and sign out, but the old scale of 250% returns. I try to manually set it to 100% and sign out, but it doesn't stick. Dialog boxes, etc. are TOO BIG. Running a Viewsonic VP3881 monitor (3840 x 1600), parallels 17.1.1, windows 11

 

there is no "error page". It simply remains at 250% scale after I sign out and sign back in. The change does not "stick"

 

I have same issue, but scale percentage is grey and unable to change as reverts back to 300%

 

I have same issue, but scale percentage is grey and unable to change as reverts back to 300%

 

Same here.

 

I had an issue with greyed out Scale section and it was locked at 175% after I've tried to set a custom scaling. To fix this I edited registry.
1. Hit Windows + R, type regedit and hit Enter to run Registry Editor
2. Navigate to HKEY_CURRENT_USER\Control Panel\Desktop
3. Look for LogPixels and double-click it
4. Change value type to decimal and enter value 96 (this equals to 100% scale). Click OK
5. Next, look for Win8DpiScaling and double-click it
6. Set value to 0. Click OK
7. Close Registry Editor. Sign out and sign back to see changer.
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After I did that Scale was not greyed out for me anymore and I cloud change it!