I have a Pfaff Quilt Expression 4.0 and I would like to sew a straight stitch along the edge of welting for a pillow cushion and I can't get the needle to move to the far left. I left my manual at home and did not find the answer in the online manual. I am using the zipper foot and just need the needle to be moved to the far left so that I can sew as close to the edge of the welting/cording.