Remove settings if theme is deleted?

As the other answers seem to imply, there is no built-in way to do this. There is no theme uninstall API similar to that for plugins. There is actually a long-standing ticket to get this feature added to WordPress core, so that themes can uninstall themselves. The consensus from the lead developers there seems to be that this isn’t a feature that want themes to have. I’m not sure what the rationale for that is. Maybe you can help explain to them the benefits of it.

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