Hi Roma,
Thanks for the reply. The problem is that I don't know what form is being displayed. And I don't see a Quick Create form under Campaign. I don't think I explained the issue well enough so I will try again:
When creating a phone call quick campaign from a marketing list in the classic web interface, I would get this phone call form as part of the wizard:

You'll notice towards the bottom there are custom fields called URL Note and URL as well as a notes field to the right. This is the 'Phone Call' form under the 'Phone Call' entity. This is the same form that appears when viewing phone calls or creating a new phone call record.
In the Unified Interface, when I go to a marketing list and create a new phone call quick campaign, the wizard presents this form:

You'll notice that this is a generic phone call form without my custom fields. The 'Phone Call' form under the 'Phone Call' entity is available in the Unified Interface. It appears when viewing or creating a new phone call record. However it does not appear in the quick campaign wizard that is opened from a marketing list. I'd like to know how to edit or replace the phone call form that appears in this wizard in the Unified Interface.
Thanks in advance for anyone's help.
Joe