[Theme Horse Support Team]

HI Marta,

The “Navigation” is a default menu that will only show up in smaller devices but not in desktop view. This menu will link to your home page and will be selected when none of the other menus are selected.

Anyways you can try below code to remove the navigation Go to Appearance -> Theme Options -> Design Options Tab -> Custom CSS paste the following CSS code and Click on save all changes button:

.tinynav option:last-child {
    display: none;
}

Hope this will help.

Thank you!