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  • I am using ACF Pro (5) and am adding fields to the registration form, but via the backend.

    You’re suggesting adding say “NULL : Option 1” in the select option list, and then checking “NULL not allowed”. Very clever – but I don’t seem to be able to format the option with the value NULL. I used this exact format:

    NULL : Option 1

    Can you advise how to make a drop-box select option “NULL”?