Hi @rivage
I’m afraid there’s no option to do it yet. If you want, you can always set a hidden class, hide it using JavaScript, or add the HTML hidden fields using the “html_after_fields” or “html_before_fields” options. This page should give you more idea about it: https://www.advancedcustomfields.com/resources/acf_form/.
If you still want that feature, you can always open a new ticket so your request can be passed directly to the plugin author. You can open a new ticket here: https://support.advancedcustomfields.com/new-ticket.
I hope this makes sense 🙂
