I have a Bernina B530 and it has that feature-so I had to go try it-right now. If I push the button before I start to stitch it takes the three stitches in place and then moves on in the normal stitch pattern. If I take a stitch or two and then push the button, it then takes the three stitches in place, and moves on. My preference is to take a stitch or two, secure the stitch and move on. By doing this you avoid the possibility of having the needle push fabric down and cause a bird's nest. Be sure your needle is not dull because that also will push fabric down into the machine and cause a mess. Since my machine stitches in place immediately when I push the button I can't comment on whether it is adjustable or not. My inclination is to say not but I really don't know.