You can change the shape of the arrowhead that's added to the selected rule.

1. Select the rule or rules whose arrowheads you want to change.

2. Choose Lines from the Draw menu, and then choose Options. The Arrow Options dialog box appears.

3. Click on the black or outline arrow to change the option. If you click on the black arrow, the arrowhead has the same pattern and color as the rule. If you click on the white arrow, the arrowhead is white with a 1-point black rule as its border.

4. Drag any one of the three handles on the model arrowhead to change its shape to the one you want to use.

5. Click Apply to see the results. Make more changes if you want to, and click Apply to see the results.

6. Click OK when you're finished.