Arrow Properties 
You can define the color and direction of arrows.
You are in Design Manually mode.
You can set the following arrow properties:
You can change the arrow color. Default inherits the color from the Arrow Defaults setting in Diagram Properties.
You can choose an arrow direction. UniDirectional for a one-pointed arrow or BiDirectional for a two-pointed arrow.
Note
Arrows maintain their direction based on how they were drawn. If you want a UniDirectional arrow to point in the opposite direction, you must delete the arrow and redraw it in the new direction.
You can change the default color of all arrows using the Arrows Defaults section in the Diagram Properties dialog box. Individual properties take precedence over default properties.
To set the properties of an arrow, select the item and choose .