1.Press (The Drag Properties dialog opens.)
2.Check Curvature.
3.Point to double-headed arrow that has the desired curvature.
4.Press and hold down the left mouse button.
5.While continuing to hold down the left mouse button, move the mouse so that it points to a double-headed arrow whose height you wish to change.
6.Release the left mouse button.
Tip
You can change the curvature of several double-headed arrows at once. First, use to select all of the double-headed arrows whose curvature you want to change. Then use to change the curvature of any one of the selected double-headed arrows. The curvatures of all the selected objects will change.