In most templates, the header is a row by default. However, in certain older templates, the header is fixed with limited customisation options. Templates with fixed headers typically include certain widgets, such as social media links or a phone number in the header by default. However, these widgets are fixed and cannot be moved like widgets in normal rows. By turning the header into a row, you can add or edit widgets just like any other row on your Site.
Locate the Website header.
Click to pull up the Images & Content Editor.
Click the "Convert header to a row" button to change the header into a row.
Things to consider
Most new templates have the header as a row by default. You'll probably run into this issue only when using older templates that still have fixed headers.
Turning a header into a row is a necessary step in order to trigger the shrinking header feature. To learn more about the shrinking header, see our support article here.