bbPress.org

https://www.dropbox.com/s/y1axqydv5hq9lww/Screen%20Shot%202020-01-07%20at%203.23.26%20AM.png?dl=0

This picture is bbpress +bbPress Topic Thumbnails plugin. I used css to remove “replies and freshness column”
I would like to know If I can move second and third content to first row. And 4,5,6 contents to second row.

Looks like this

Current layout is
Content 1
Content 2
Content 3
Content 4
Content 5
Content 6

But how can I change to

Content 1, Content 2, Content 3
Content 4, Content 5, Content 6

I would like to know if there is solution adding on CSS or function.php

Thank you !