in
the Toolbar. The ruler's display units are set in the Rulers and Units
tab of the General Program Preferences.To display a horizontal ruler above the canvas area and a vertical ruler
to the left of the canvas area, choose View
> Rulers or click the Toggle Rulers button in
the Toolbar. The ruler's display units are set in the Rulers and Units
tab of the General Program Preferences.
To turn off the ruler display, click the Toggle Rulers button again, or choose View > Rulers again.