Application version
Cura 4.5 beta, 4.5, 4.6 beta, 4.6.
Platform
Windows 10 Version 10.0.018362 Build 18362
GTX 1080, driver version 445.75
Printer
Ender 3
Reproduction steps
Not really repeatable, just constantly blurry.
Blurry text regardless of light mode, or dark mode.
I uninstalled and reinstalled multiple times, tried version 4.5 beta, 4.5, 4.6 beta, and 4.6.
Text is normal in the preferences tab.
Screenshot(s)
https://imgur.com/a/6GGZtuy
Top screenshot is Cura 4.4. The rest are 4.6
Actual results
Nothing changes.
Expected results
N/A
Project file
N/A
Log file
Additional information
N/A
Possibly related to this? https://github.com/Ultimaker/Cura/issues/5586
What strikes me as odd is that the titlebar text and menu item text in your screenshots looks suspect too:

The top 2 are yours, the bottom one is mine.
Yeah that's really weird. Are title bars for other applications blurry as well?
Yeah that's really weird. Are title bars for other applications blurry as well?
No, Cura 4.5 and above is the only time I've had this issue. 4.4 and below work fine.
It was an issue with Windows ClearType text.
Most helpful comment
It was an issue with Windows ClearType text.