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Doing so will open the Header options menu in the bar near the top of the Word window. There are a couple of aspects of the header that you can edit in the "Options" and "Position" sections:   Different First Page - Check this box to customize your document's first page's header. It will appear different than the header on the rest of the pages.  Header Position - Change the number in the "Header from Top" box to raise or lower the header's position on the page. This will select it, which will allow you to modify it as needed. If you're using the "Different First Page" option, you'll need to do this on a page other than the first for your changes to apply across your document (first page aside). Doing so will allow you to edit the header by using options in the following sections:   Font - Edit your text's font, size, color, and general formatting (e.g., bolding or underlining).  Paragraph - Change your header's orientation (e.g., centered). It's below your header's text; doing so will save your changes and close the header section.
Double-click your header text. Review the header's basic settings. Click and drag your cursor across the header text. Click the Home tab. Double-click the "Header" tab.