Sub forums

Just noticed some people with sub forums being displayed on the main board and I can't seem to find the option for it. Could someone point me into the right direction? Thanks in advance.

Not that I know of at current, I did search to see if anything was built in to make it like the above but it seems the only available option at the moment from the main core is to have it in dropdown menu. This was the easiest one I found that doesn't take too long to install or have too many edits that would allow me to have the subforums in a basic display like on say vB and also to get rid of the dropdown's on the forum home.