A family of Microsoft word processing software products for creating web, email, and print documents.
To clarify, every Word document will have header and footer parts, even if they are empty and use no room. That is part of the document structure.
Stefan has asked a cogent question and Suzanne had told you how to remove the content from any header or footer.
Are you using the desktop application or Word online?
These behave differently and have different controls even though they work with the same documents.