Board Thread:Support Requests - Getting Technical/@comment-44979780-20200306230406/@comment-9605025-20200307213745

The other wiki is using an independent and/or old version of the collapse feature. You could copy the JS they use to implement it but it is probably simpler to use the version FANDOM already provides. You can read more about the collapse feature here. To adjust the template you copied to use FANDOM's standard collapse feature, simply add "mw-" to the start of the relevant classes. In other words, instead of {| class="collapsible collapsed toccolours" use this {| class="mw-collapsible mw-collapsed toccolours"