How can I create a category-based forum like bbpress style?

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In the case of bbpress, the first index page looks like "category (forum, forum,....)".

For example,
1) Regional Forums (asia, africa, america)
2) News (illness, trouble, hospital)
3) General Forums (men's talk, women's talk)

On the other hand, in the case of forumwp, it looks like "forum (category, category,...)" as shown below.

1) asia (regional forums)
2) africa (regional forums)
3) america (regional forums)
4) illness (news)
5) trouble (news)
6) hospital (news)
7) men's talk (General Forums)
8) women's talk General Forums)

How can I set it to look like bbpress style?