This dialog appears, if you do the following:
Use the Select Team Members for Team "<team name>" dialog to view and select the operators who shall be members of the selected operator team.
The list field displays all users specified for the system who have Operator access rights.
The list field displays the operators currently selected for the <team name> operator team.
Adds the operator selected in the All Items list field to the <team name> operator team.
Removes the operator selected in the Selected Items list field from the <team name> operator team.