There are four locations in your theme where you can place a custom menu.
- Primary Site Menu: below the header.
- Secondary Site Menu: below Primary Site Menu (only available on Blog archives and posts).
- Primary Meta Menu: at the top left, in the fixed menu bar (only available if the site title is not displayed in the same location).
- Secondary Meta Menu: at the top right of the fixed menu bar.
Descriptions of positions refer to screens of 1024 Pixels width and above.
Deactivate the fixed top menu bar completely
Just deactivate both of the Meta menues and deactivate the header option Show header text. That’s it, the fixed menu bar will retire discretely.