The Edge Pad is a means of protecting the edges of the stitches from have excessive needle penetrations which can pull on the fabric and pucker.
When patterning, the needle penetrations can lie next to one another causing the fabric to lash or even cut. If this is a danger for the fabric being embroidered, set the “Reverse” to “None” which means the pattern will only occur on every other stroke of the satin. The pattern effect will be lighter, but the embroidery will be better and the fabric will not have as many cuts.