Triple stitch is a row of small three-part stitches, each composed of one stitch going forward, one going backward then one going forward. The stitch length can be changed from 1mm to 12mm for individual lines in the properties dialog.
To show the Triple Stitch dialog
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With a triple stitch line selected, Control–click and choose Edit Triple Stitch.
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With a triple stitch line selected, click the Properties button.
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Convert a line type to Triple Stitch in the Object window. The Properties dialog appears.
Length
Set the Length of Triple stitch from 1 to 12mm in steps of 0.1mm. The initial setting is 2mm.