Showing thread prefixes on the forum index was a change made by XenForo devs from 2.0.x to 2.1.x.
I personally think it looks a bit messy, so I decided to revert the change..
I'd recommend doing this as a template modification, but this is the code:
Find:
Replace with:
Before:

After:

I personally think it looks a bit messy, so I decided to revert the change..

I'd recommend doing this as a template modification, but this is the code:
node_list_forum
Find:
Replace with:
Before:

After:
