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The footnote preview is a window that pops up when you select the footnote. It has up to the first 6 or 7 lines of footnote text and a button to "see more" which takes you to the footnotes page (which really ends up being an endnote). Epubs take you to the footnotes page where you have more than one footnote showing.
I highly suspect that you are (or were) sending your books to the device from calibre as a kepub rather than an epub. True epubs have never had preview windows even in any of the beta versions I've seen (not all of which make it to public release).
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