Windows 10 has started displaying the wrong fonts in certain areas, most frequently tab labels and some other dialog boxes. It should be displaying Segoe UI instead of what I think is MS Sans Serif.
To reiterate, 99% of the fonts are the correct font face and size; only a handful of cases seem to revert to stupidly large MS Sans Serif.
I managed to solve this problem once before by tweaking some regional or language setting back to US (from Australia). Unfortunately, I can't seem to replicate the fix by doing what I did before, and I cannot find any useful information, as just about every search is just full of more general font-scaling or blurry-font issues.
This question closely describes my problem, but for Windows XP, and the suggested resolution does not work in my case.
Stupidly big tab labels
Stupidly big dialog text