Board Thread:Support Requests - Getting Technical/@comment-35240488-20181029152137/@comment-9605025-20181030221604

I am with Fandyllic, I doubt the collapsing works on mobile. In fact, I checked using the mobile skin and it didn't. Perhaps you are confusing the section collapsing with the navbox collapsing? The navbox is in the references section; so you can expand/collapse the references section and thus hide/show the navbox. However, the navbox itself is not collapsible.

If you still want to give it a try, you could just copy everything related to the template just to test it out on your wiki. Here is a list of the dependencies. Each page is listed once even if used by multiple other pages.
 * Template:Navbox_characters (doc)
 * Template:Navbox (doc)
 * Module:Loops
 * Template:Translation/element (doc)
 * irrelevant to your application
 * no need to copy
 * may want to remove corresponding portion of module
 * Template:Documentation
 * Template:Navbox/element (doc)
 * Template:Documentation
 * Template:Documentation
 * Template:Dots (doc)
 * Module:Loops
 * Template:Documentation
 * Template:Documentation (doc)
 * you should already have an equivalent
 * no need to copy
 * Template:Documentation