Wells template: how to show sidebar nav on mobile

Greetings! It's my first post here.

I am creating a site using the Wells template.
Does anyone know how to have all sidebar menu links show on mobile devices?

Note: they display perfectly on desktop.
But on mobile, only the single word "Menu" appears.
I'm seeking to have all my menu links appear (Visualizing Stories, Reaching Audiences, etc etc)
- instead of just that one word, Menu.

Thanks in advance!!