My b2evolution Version: Not Entered

Hey all, Ive been searching around but I cant seem to find any info on this. I would like to see how many posts are in each category next to it, similar to Wordpress. I am also using Collapsible Categories plugin if that makes a difference.

Example:

Category A
Sub Category (6)

Thanks! Oops, forgot to add the b2 version I'm using. 3.3.1