- Click Home tab
Annotation panel
Dimension Style.
Enter dimstyle at the Command prompt. - In the Dimension Style Manager, select the style you want to change. Click Modify.
- In the Modify Dimension Style dialog box, Symbols and Arrows tab, under Arrowheads, select the arrowhead type for the first end of the dimension line.
- To set the second end of the dimension line to a different arrowhead type, select an arrowhead type from the Second list.
- In the Size box, enter a size for the arrowhead.
- Click OK.
- Click Close to exit the Dimension Style Manager.