Since you're using Pro so you can simply hide your desktop menu in mobile screens and display a Navigation Collapsed element in its place. To do this add two bars in header builder (one for Desktop screens and other for mobile screens)
In the Desktop Bar, add Navigation Inline element and hide the bar in smaller screens using Hide During Breakpoints feature (see screenshot)
In the Mobile Bar add Navigation Collapsed element and hide the bar in large screens in a similar way:
Hope this helps!