By default the Use connector in Use Cases has no arrow head. To generate arrow heads on the connectors, follow the steps below.
|1.||Select the Tools | Options Links menu option. The Links page of the Options dialog displays.|
|2.||In the General panel, select the Show Uses arrowheads checkbox.|
|3.||Click on the Close button.|
When you save the Use Case diagram, the Use connectors change to display arrowheads.