On the creation screen of Issues of incident type that the Agent sees, not all the fields configured for this view are visible, but they are displayed when they are enabled for the portal where the Customer.
To configure the Agent screen I access to configure by Project Configuration / Screen / Create Incident

To configure the portal I access to configure by Project Configuration / Types of Request / Incidents / Report Productive Incident

When I add a field in this view, if it is seen on the Agent issue creation screen.
How can I make sure that the incident creation screen that the Agent has has fields that do not appear in the Customers portal?