Board Thread:Support Requests - Getting Technical/@comment-1807002-20150930004852/@comment-4731443-20150930040255

Well, you can make any container collapsible by adding the "mw-collapsible" and optionally "mw-collapsed" classes to it, including your existing Template:Contents tables. Making a smaller version of them is just a matter of using different styling for your headers and such.

I made a demo using divs presented in an infobox-like sidebar and another with full-width containers here.