Janome Skyline 55 Instruction Book page 57

d1–d4
To adjust the evenness of darning stitches
You can correct unevenness of darning stitches by
pressing the "
adjusting key.
If the left corner is lower than the right side, press the
" " key to correct it, and vice versa.
NOTE:
The evenness can be adjusted within d1 to d9
(default setting is d5).
d6–d9
55
" or " " key of the stitch length