Double stitch is a row of small stitches going forward, followed by a row of small stitches going backward, so it ends at the same point where it began.
Double stitch is used for markout and to place branching outlines that need to return to their starting points.
To show the Double Stitch dialog
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With a double stitch line selected, Control–click and choose Edit Double Stitch.
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With a double stitch line selected, click the Properties button.
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Convert a line type to Double Stitch in the Object window. The Properties dialog appears.
Length
Set the Length of Double stitch from 1 to 12mm in steps of 0.1mm. The initial setting is 2mm.