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Neogenesis, an e-ARC I got from Baen a week or so ago and sideloaded into Calibre, has the boldness slider.
For what it's worth, the book I have been reading, an old book that was in Mobi format, I converted to AZ3 in Calibre and still didn't get the boldness slider. So I deleted it from Calibre, loaded it again from Kindle for Mac and converted that to AZ3 and the boldness slider is there. No idea why the difference; probably others will know.
JIm
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