Baby Lock Evolve (Previous Model) (BLE8W) Instruction and Reference Guide - Manual (Page 47)

Balanced tension -
Chain stitch has correct tension when the needle thread sews a straight
seam on the top side and the chain looper thread forms loops on the
under side of the fabric.
Needle thread is too loose -
Turn the chain/cover needle thread tension dial to a higher number. Or
turn the chain looper tension dial to a narrower dash for looser tension.
(Narrow dashes are looser tension).
Needle thread is too tight -
Turn the chain/cover needle thread tension dial to a lower number. Or
turn the chain looper tension dial to a wider dash for tighter tension.
(Wider dashes are tighter tension).
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Chain Stitching - continued
Needle thread is too loose
Needle thread is too tight
* Tension Adjustment
Balanced tension
under side
top side