Clarified gives you a couple of header styles, one is the default wide layout:

screenshot demo for the default Clarified header style

If you prefer a centered layout:

screenshot demo for the alternate Clarified header style

The banner section is not part of the header, but to set your header style, follow these steps:

  1. Go to the Appearance > Customize > Other Options
  2. Use the drop-down list to choose your header layout
  3. Click the Publish button.