Brother PE 400D - Manual (Page 87)

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Moving the embroidery location
Use directional arrows to change the placement of pattern on the
fabric.
CAUTION
Do not lower the needle while the hoop is in motion. Doing
so could cause broken needles and possible injury.
Checking the embroidering area
Press “ ” key to move the hoop so you can check your
work. Make sure to watch it closely to make sure it returns to the
exact same position when you're done checking your work.
CAUTION
Do not lower the needle while the hoop is in motion. Doing
so could cause broken needles and possible injury.