I don't remember the click bar having that stopper ball, maybe I am wrong but it leaves me blank as to why it's there.
Maybe a personal modification, it is a stopper ball as the stainless grub screw is clearly visible, if you insert a small Allen key into the grub screw you can clamp the ball to the line.
Not a great idea as that would prevent your safety release system from operating correctly. If at all.
What's at the top of the red line? Just before it changes to the standard flying line?
There should be a spliced in stopper ball, if not then move that black "lock off" ball you have to the top of the thicker red line, fixing it tight at that point to stop your bar flying too far up you lines in the event of you fireing off your safety.