The data-nav-setup attribute controls whether you will have a simple nav setup or custom nav setup. It has two possible values, ‘custom’, or ‘simple’.

By default the plugin uses the custom setup, this allows you to create a custom secondary nav for multiple different pages by adding the html into your code block (following the steps above).

The simple setup allows you to create a dropdown in your Main Nav area of your Pages section that will hold all the secondary nav items you want. Create a new dropdown in your Main Nav area and make the URL of this dropdown "/secondary-nav". Any links you place within this dropdown will become your secondary nav. You should only use this is you’re putting the secondary nav on every page of your website.