Locking and Unlocking the Rulers

To prevent the zero point of the rulers from being moved, you can lock the rulers.

Step 1
Choose Rulers, Grid & Guides from the View menu.

Step 2
Click the check box labeled Lock under the Rulers heading in the Rulers, Grid & Guides dialog, then click OK.

Step 3
To unlock the rulers, click the Lock check box in the dialog again, then click OK.

See also:
Rulers & Grid, Customizing

End of Topic