I can only do the following there:
From this panel you can add, delete, edit, re-order and re-synchronise categories and forums.
What I want to do is make the main categories either collapsable or open into another page for the forums within each category.
I have seen this done on several forums found here from either examples or where people had questions and I checked out there forum from the links posted. I don't want to fool around testing this on a live forum otherwise I would play around with the php files myself. Hopefully someone can show me which files to change, I don't see this as a function in the acp anywhere and I currently am running 2.0.8 I would like to change this before I upgrade because I want to backup the whole directory prior to the upgrade and want everything in place before hand.