In Word page layout can affect how content looks in documents. When using Word paper size and page margins can be easily changed.
By default, the page size of a new document is 8.5 inches by 11 inches. Depending on your project, you may need to adjust your document's page size. It's important to note that before modifying the default page size, you should check to see which page sizes your printer can accommodate.
Word has a variety of predefined page sizes to choose from.
Word also allows you to customize the page size in the Page Setup dialog box.