Toggle Directionality 
The Toggle Directionality command, accessed on the Diagram ribbon, enables you to toggle the directionality of a UMLAssociation between two Components on a Class diagram. The values are Bidirectional or Unidirectional.
The Toggle Directionality command, accessed on the Diagram ribbon, enables you to toggle the directionality of a UMLAssociation between two Components on a Class diagram. The values are Bidirectional or Unidirectional.