This is very likely a very silly question, so apologies in advance.
I have a model and put the arms in a polygroup. Then I pressed a button by accident and lines appeared at the lines of the polygroup; lines that are also visible when polyframe view is disabled. It is kinda annoying me, but I cannot find a way to switch it off. And without knowing the name of these lines I cannot find instructions on that online. So can anyone help me?
So many thanks in advance 
