How do I sew in reverse on the XG4099-001?
To sew in reverse, push the reverse sewing lever in as far as possible and hold it in that position while you lightly press the foot controller. To return to forward sewing, simply release the reverse sewing lever. Note that the length of reverse stitches is fixed at 2 mm (1/16 inch). (Page 1)
From the official Brother XG4099-001 Computerized Sewing Machine manual, page 1
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