What "book mode"?
What version of Sigil are you using?
What do you mean "eventually disappear"?
You are not by chance opening an ebook in Sigil and leaving it open for days and days on end, never closing the epub/Sigil are you? If so your computer is deleting the files out of under Sigil's tmp folder workspace. You should tell it to stop doing that, or change Sigil's tmp folder setting to someplace that is not "auto-cleaned" by your os.
The latest Sigil version has prevented this automatically by no longer using tmp.
Last edited by KevinH; 03-25-2023 at 08:21 AM.
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