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I downloaded the preview of this Life Probe book and have no issue with changing the font size but that doesn't mean there isn't something wrong with the full version of the book. The web site says it is available as a DRM free epub so you might want to download that version of the book rather than the kepub and see if that allows you to change the font size or not, and because it is DRM free you should be able edit it to fix the problem if the epub doesn't work properly either.
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