The font size is hard coded into the theme, so it can’t be overwritten with the text size selector. It would be a fairly small change to update the theme to set the font size based on the classes that get added to Discourse by the text size selector. I’ve tested it out with the font set to 14px, and it seems to me that the theme still looks good with the font at this size. It is possible that it breaks the layout in places that I haven’t looked at though.
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