Show or hide the ruler
Horizontal and vertical rulers help you align text, graphics, tables, and other elements in your document.
To see the rulers, choose View and select the Ruler check box.
If you don't see the vertical ruler, go to the File tab, choose Options > Advanced, and under Display, select the Show vertical ruler in Print Layout view check box.
Tip: This is also where you can switch the ruler to show inches, centimeters, or other units of measure.