View → Ruler
View → Ruler toggles the display of the ruler. The ruler can be used to change the layout of a document by adjusting margins and setting indents. Double-click the ruler to open the Page Setup dialog box, which is used to set margins and change other page settings. See Chapter 4, for more on page setup.
To adjust margins with the ruler, point to the spot where the gray margin area meets the white portion of the ruler. When your mouse turns to a two-headed arrow, drag your mouse to change the margin setting—increasing the margin area reduces the amount of the page on which you can type, decreasing the margin gives you more room on the page. You can do this on both the left and right ends of the horizontal ruler, and at the top and bottom of the vertical ruler. Later, if you choose to view or edit your margins through the Page Setup dialog box (File → Page Setup), you’ll see the measurements attained by your adjustment of the margins from the ruler.
Rulers work a bit differently in different views:
In Print Layout view, turning the Ruler on displays both the horizontal and vertical rulers.
In Outline view, the Ruler command is unavailable.
To display the vertical ruler in Normal view, choose Tools → Options → View → “Vertical ruler.” Use the same technique to turn off the vertical ruler in Print Layout view.
Indents control the horizontal position of paragraphs on the page. To set indents on the ruler, click inside a single paragraph to be adjusted, or select ...