After you've chosen the type of header background you'd like to use, you may need to adjust your header background settings to ensure your background displays the way you'd like it to.
To see your header background settings, click on the Builder icon and hover over design then click on header background.
From there, click on the settings tab and you'll see your settings options. Most header backgrounds will look best either tiled or centered.
Select the setting you'd prefer for your header background and click on save changes.