1.Press (Menu: View→Interface Properties).
2.Select Misc.
3.Check Display double arrowheads
4.Press Apply.
Tip
Checking the Display double arrowheads box causes double-headed arrows to be drawn with arrowheads (the usual convention). Leaving the box unchecked causes arrowheads to be omitted from double-headed arrows. This style for path diagrams was employed by Steiger (1989).