Open the Google Docs document
Double-click the header area at the top of the page
Select the header text or content
Press Backspace or Delete
If needed, go to Format
Select Headers & footers
Choose Remove header
Save the document
Open the Google Docs document
Double-click the header area at the top of the page
Select the header text or content
Press Backspace or Delete
If needed, go to Format
Select Headers & footers
Choose Remove header
Save the document