Baby Lock Enlighten (BLE3ATW-2) Instruction and Reference Guide - Manual (Page 24)

Narrow Hemming is an attractive finish for light to medium to heavy
weight fabrics.
Remove the left needle and left needle thread completely from the
machine. Clear the stitch fingers. Turn the stitch length adjusting dial
counter-clockwise to the rolled hem range. Set the length at "0.75 to
4.0" (fig. A) and the stitch width at 3.0 for a smooth decorative finish
(fig. B).
Move the stitch selector lever to "C".
For the right needle 3-thread narrow hemming, follow the suggested
settings and the threading diagram below.
3
T
H
R
E
A
D
O
V
E
R
L
O
C
K
22
3-Thread Overlock-Narrow Hem
B
A
NEEDLES
right
LENGTH
0.75-4.0R
WIDTH
3.0
STITCH
SELECTOR
C
WAVE
SELECTOR
OVERLOCK