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AFAIK the calibre ebook editor doesn't support user developed plugins, so I assume you're trying to use the Library Manager plugin framework.
To have the features you want (footnotes, tooltips, margin notes, sidebars etc) I would use a fixed-layout/desktop-publishing editor (e.g. Adobe InDesign, Quark) or a word-processor (Word, LO Writer, WordPerfect) as the starting point and publish the output as a PDF.
BR
Last edited by BetterRed; 10-25-2025 at 01:54 AM.
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