[Plugin: Collapsing Categories] Accordion style opening and closing

Great plugin
I was able to really get into the CSS and modify it for my client

Question: I want to only have one category open at a time, more accordion type action than the current multiple open div action.

When a user clicks on Category 2, all other cats close, 2 opens

https://www.ads-software.com/extend/plugins/collapsing-categories/