If you are working with a drm free ePUB that came to you with a calibre stylesheet (CSS), several features may not work--depending on the choices the person who did the conversion set it up. If you go into Convert Books and then choose Look and Feel, you have a choice in the Filter Style Selection tab of the big text box to remove fonts, margins, and various other things.
I have never had this problem, btw, with a book I bought in epUB format, imported from ADE (and magically lost the drm in doing so) and then made no alterations that resulted in a change in style sheets.
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