You probably try to edit the *.ncx of an epub3, but for this format the ToC is in a nav document (xhtml format). The ncx is there (and facultative) only for backward compatibility.
The best and more secure way to edit a ToC is to use the dedicated tool of calibre: menu tools / ToC / edit ToC, or the icon "Modify ToC" in the toolbar.
Last edited by lomkiri; 06-20-2024 at 12:30 PM.
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