How to change page margins
To change the margins of a document, go to the “PAGE LAYOUT” tab and click “Margins”. Here you can select between a number of pre-defined margin settings. You can also define exactly how wide you want the margins to be by clicking, “Custom” and entering the exact measurements. I’ll click cancel here and go back to the Margin settings. If you have set up custom margins before, the last used custom settings are available in the menu. In this case I’ll select “Narrow” margins and as you can see the text now fills out more of the page.