User blog comment:Imamadmad/New Navbox/@comment-21225777-20140103152818/@comment-4189499-20140107011729

Wikia have replied and confirmed that there is no current way of collapsing tables in the Mobile Skin because the Mobile Skin strips all JavaScript to improve load times, however Mira (the person who replied to my message) has told me that there is now an official feature request for it, so it will become available at some point in the future, at which point I can weave it into the navbox.