How to disable user Account Required for all internal requests?

Summary:

Currently, when a requestor goes through the "request supplier" process, it requires at least one contact user account. The organization does not want to enforce user accounts. Where do we remove that requirement? Previously, this was available via the task: Configure Supplier Registration and Profile Change Request. That is no longer a task we can use - it has changed to "Configure Supplier Profile Change Request" but there is no option to turn off that requirement around the user contact. How can we not require a user account as per the internal request for a supplier via requisition page?