Some of our clients want to use marketing forms and sometimes add for example a dropdown form field only for to ask for a special interest or anything else. The Submitted value should only be visible in the saved form submission and should be not mapped to another entity.
Ideas Administrator

Thank you for your feedback. It is possible to configure the field so it is not mapped to any contact or lead. Please see this section of documentation for more details: Set up and manage marketing forms for use in marketing pages (Dynamics 365 Marketing) | Microsoft Docs. Sincerely, Petr Jantac, Microsoft