Expanded nav on large screens and collapsed on small screens

[abstractindia]

I am trying to make the nav expanded for large screens (above 768px) and collapsed nav on small screens (below 768px) which can be opened by taping on toggle. The option expanded : true is making the nav expanded even on small screens. What option should I tweak to make this possible?

[somewebmedia]

I'll probably have to introduce a new option to the plugin.