Hello, thanks for your purchase.
To make it work that way you would have to put the first link as the first element in the page (the Header for instance).
Example:
<ul class="nav nav-list mb-xl show-bg-active">
<li class="active"><a data-hash data-hash-offset="85" href="#header">First</a></li>
<li>
<a data-hash data-hash-offset="85" href="#second">Second</a>
<ul>
<li><a data-hash data-hash-offset="85" href="#sub-second-1">Sub Second 1</a></li>
<li><a data-hash data-hash-offset="85" href="#sub-second-2">Sub Second 2</a></li>
</ul>
</li>
<li><a data-hash data-hash-offset="85" href="#third">Third</a></li>
</ul>
Kind Regards,
Jonas