- 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 Center Marks, click Line.
- In the Size box, enter the length of the centerline overshoot. Click OK.
- Click Close to exit the Dimension Style Manager.
- Click Annotate tab
Dimensions panel
Center Mark.
At the Command prompt, enter dimcenter. - Select an arc or a circle.