MS Word is one of the longest-running and highest-selling word processors in computer history. With it, users can create a variety of documents that can be custom formatted in nearly any way. One of the options available to users of MS Word is the ability to change the size of the document header.
In a new document, click "View."
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Click on "Header and Footer" in the drop-down menu. The header mini-menu will pop up in your document.
Click on the icon that looks like an open book to take you to the Page Setup. Once there, click on the tab for Margins.
In the box for Header you can change how far the header is from the top of the page. This will shrink or expand the header.
To change the size of the font in your header, highlight the words inside the header, go to the font size icon on the top panel, and scroll to the size of the font you want.