Run command to change flag responsible for using custom CSS in redis.
hset config useCustomCSS 0
As replied here https://community.nodebb.org/topic/2217/how-can-i-display-3-columns-in-the-lavender-homepage/2
Just change col-md-4 by col-md-2 And on the first category you need to add col-md-offset-1 aswell.
This method will only work with second solution. Or you can add col-md-2 col-md-offset-1 aswell on the first item in ACP after doing first solution.