No matter what I write it will try to be helpful and suggest a post that is “similar”. That sounds cool, but it rarely has anything to do with what I’m writing. 
This wouldn’t be so bad if it didn’t at the same time completely block the preview area!
Point in case:
You can close that pane with the cross ×.
Sometimes it gives good results, never for you?
I think it really wants to display at least one result by all means.
For further suggestions, the Discourse official forum is below. 
I’m aware that I can close it, my point was just that the algorithm is so inaccurate it never finds anything that is actually similar (yet offers up a random post anyway). The idea behind the feature is great, it just needs some work 
