I use ACF for custom post type Business. In the business posts, I use mailto:[email protected] as the url so that I can then use an elementor button dynamically populated with the url field. How do I remove this validation?
You cannot remove the ACF validation. A URL field only accepts values that match the pattern "#^https?://#"
You have to use a text field for this and then add your own validation using an acf/validate_value filter.