Hi ElineB,
what does 'unmapped form fields' mean?
You want to create add one Form Field without having to map to contact/lead field?
Why do you want to do this?
Due to CRM will map each form submission to a contact/lead record(creation or update),
so it's necessary for user to map form field to existing field in contact/lead entity if the field is added to marketing form.
In fact, you can add it to the form and an alert message will appear, but it does not prevent go live the marketing form.
