Rulers help you to align items horizontally or vertically on a page. You can use the rulers to set indents and returns. You can also use the rulers to determine the dimensions of the publication elements, such as the margins, text boxes, columns, and so on.
1. Rulers (horizontal and vertical)
2. Horizontal ruler guide
Show or hide the rulers
On the View menu, click Rulers to show or hide the rulers.
Show or hide the ruler guide
To show the ruler guide, point to the ruler's inside edge until the pointer becomes a double-headed arrow, and then drag the guide from the ruler to your publication.
To hide the ruler guide, point to it until the pointer becomes a double-headed arrow, and then drag it off your publication.
Show or hide the row guides or column guides
On the View menu, click Boundaries and Guides.