Usually, the Codex is a good resource for doing research on things like this … and there are functions related to register_setting()
listed directly on it’s page in the Codex.
The function you’re looking for is unregister_setting()
. From it’s Codex page:
Description
Allows clean de-registration of registered settings. Should be used mostly in deactivation hooks.
Usage
unregister_setting( $option_group, $option_name, $sanitize_callback );
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