Why won't the header show up?

[Confusedatwork]

If the document is printed then the header is visible. I want the header to
be seen on the document on the computer.

 

[Suzanne S. Barnhill]

Assuming you're in Print Layout view (the only one in which the header is
displayed), see http://sbarnhill.mvps.org/WordFAQs/WhiteSpace.htm