How to create a line bline

Ive noticed that if you don’t loop bline the bline does not end but in this video you don’t have to loop to end bline … re=related

How did he do that

The Bline is created when changing to another tool or when the gears button is pressed on the Tool Options panel. In the example he changed to other tool.

Thanks but what is this gear button you speak of

That one: