BETA version -- 5.0.1002.182

[Admini]

In which Chrome theme can I increase the interface font?

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Of course the first)

You are right, font sizes are not customizable in Chrome theme, only colors and backgrounds.
So I recommended the two tools to change font size in #253.
Cent doesn't support using CSS to change UI fonts for now.
If you don't want to change system font settings, just want to change browser font, there may be no way except "force-device-scale-factor".