Board Thread:Support Requests - Getting Technical/@comment-14282052-20161026044442/@comment-24155515-20161029012329

Just add the following code to the beginning part of the 2010 version of the template:

class="wikitable mw-collapsible mw-collapsed"

like so:

which produces:

(EDIT: Okay, this doesn't look right now that I've saved it, but the same template example has been added to the page I link below.)

mw-collapsible makes it a collapsible table; mw-collapsed makes it start collapsed. That's the simplest way to create a collapsible table. I've created a guide with more in-depth examples on the wiki I admin: w:c:wreckitralph:User:Citrusellaeditswikis/Template playground/Collapsible navbox