Collaboration entails assigning a task to any user in the organizational structure defined. You may want to show your own list of people to assign in a Web Panel, but if you do not write an object name indicating where the user can choose a collaboration, GXflow will show its own window dialog.
Note: This property is active only if the value of the Allow Collaboration property is set to True.
Objects: Business Process Diagram (User Task)
Filter by Organizational Unit in Collaboration Property
Collaboration mode property