If you are actually using Word 2007, double-clicking the header should work, as I suggested in my previous reply. You'll notice how the header (and footer) becomes active and the main body of the document will be greyed out.
I don't know about OpenOffice (that would be the topic for an OpenOffice forum).
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Stefan Blom
Microsoft Word MVP
Microsoft 365 apps for business
Windows 11 Professional
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