Show or hide rulers in Visio

On the View tab, select the checkbox next to Ruler.

Notes: 

• Each drawing window has vertical and horizontal rulers that show measurements at the scale of the drawing.

• The intervals of the ruler correspond to the measurement units you set in the Page Properties tab in the Page Setup dialog box.

• The units that appear on the ruler and the location of the zero point, or starting point, for both rulers are set in the Ruler & Grid dialog box. For more information about ruler settings, see Change the ruler measurement units.

• When you move shapes in a drawing, faint lines appear on the rulers to indicate the position of the shapes.