Gary, I hate to have to break it to you after all this time, but what you are doing is leaving the main area of the screen slightly blurry. With a windows scaling of 150% rather than my 175% scaling it will be less pronounced, but it's definitely there!
Here is the difference on my screen.
A) Having the Xara UI readable, but the main screen area blurred looks like this:
https://iili.io/JaMN4t.png
B) Having the Xara UI illegible but the main screen area pin-sharp looks like this:
https://iili.io/JaMe3X.png
To get clear the way to change form A) to B) is:
Xara shortcut icon ==> Right-click ==> Properties ==> Compatibility ==> Change High DPI Settings ==> High DPI Scaling Override ==> [Tick box] ==> Scaling performed by Application
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