FIXED. Bug in Settings>Appearance>Customize Fonts.

[leopeva64-2_]

When the font size is changed with the second slider, there is no number that indicates the exact size of the font:

In Chrome, when changing the font size with the second slider, there are two numbers indicating the exact size of the font, one next to the text and another one that appears when hover the pointer over the slider:

[#2 · Accepted solution]

@leopeva64-2_, I have reached out to the team that owns the font rendering to see if this is a known issue.  Thank you for alerting us to it.  Thanks - Elliot

[#3]

Microsoft has fixed this bug in Version 80.0.315.0: