Hmm didn't work for me. I'm using the Dawn theme, if that matters.

this doesn't work

I think it's caused by the "greeting message" which starts a "conversation" and disabling the greeting message would solve the problem.. unfortunately in the theme editor, one cannot leave the "greeting message" field blank. 

didn't work for me

none of the above options work

I agree, it's obnoxious design and should be editable / removable... wish I was a coder who could offer a solution.