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Copy the text that has text that wont change size and paste it into a word document and change the size there. Then paste it back into your scrivener document, not the most eloquent way to do this ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/41526 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/