Board Thread:Support Requests - Getting Technical/@comment-3237614-20130106042559/@comment-4674838-20130106044356

If you look at the top of w:c:zh.inuyasha:Template:犬妖怪, it has: class="collapsible collapsed" change that to: class="mw-collapsible mw-collapsed" and it should make the table collapsible.
 * makes the Expand/Collapse link appear.
 * is an extra setting which makes it so the table is initially collapsed when you first view the page.

See Help:Collapsing for more detailed information about how to use collapsible tables.