Ensure that you have the Page Layout tab selected, and then select the Margins button (Figure 1).

Figure 1

Upon selecting the Margins button, a dropdown menu will appear in which you can select one of the Margin options or you can customize your margins by selecting the “Custom Margins…” at the bottom of the menu (Figure 2).
 

Figure 2

Figure 3

If you choose the Custom Margins…option, the Page Setup window will display. You can then make your desired Margins changes along with changing the Orientation layout of the document. Once you have made all of your desired changes, select the OK button.

If you are not using standard Letter paper, you can change the paper size but selecting the Custom Margins…option. You can then select the desired paper type by selecting the Paper. Then under the Paper size, select the appropriate paper size (Figure 4). After you have made the necessary changes, select the OK button.

Figure 4

To make changes to the Layout of your current working document, select the Custom Margins…option. The Page Setup window will then be displayed and select the Layout tab (Figure 5).

Figure 5

Under the Sections section, you can select for the format to be continuous, New page, Odd page, Even page, or New column. You can then make the necessary changes to any headers and/or footers, Page alignment. Once you have made the necessary changes, select the OK button.