I find the default Calibre page splitting options to be a hindrance. They are no doubt great, (probably essential) when converting non e-book documents to e-book formats. However, E-book formats (epub, mobi, azw3, etc.) are probably already split (or at least have page breaks), and adding heuristics to create new splits can often muddle thing, so I change these defaults in my own config.:
Under Structure Detection, Chapter Mark setting is changed from "Page Break" to none,
Insert Page Breaks before Xpath: is disabled ( / )
Some books need to have page breaks removed from their CSS when used inappropriately.. (I've seen many books with a css page-break-before: always in their chapter headings, but also have some kind of graphic at the top of the page. When run through an e-book conversion, this causes the graphic to be put on a page by itself.)
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