Right-click the connector.
Click Curved Connector, Right-Angle Connector, or Straight Connector.
Note: You cannot add handles to straight or right-angle connectors, but you can use the Pencil tool to add handles to curved connectors.
Tip: To make the default connector straight or curved, on the File menu, click Page Setup, click the Layout and Routing tab, and then in the Appearance list, click Straight or Curved. New connectors that you add to your drawing will now be straight or curved.