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I use the the GUI gnome-tweaks to make sure that under Styles (in the Appearance section), the Legacy App style is set to Gnome's Adawaita (default). If it's set to something else, Sigil doesn't always honor Gnome's light/dark switching. But that's mostly because I have multiple DEs installed on my Arch System. So when I switch to Gnome from something else, that Legacy App setting is often set to something different.
Hope something there helps.
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