Pfaff creative sensation pro Owner's Manual page 51

Dynamic spring foot 6D for embroidery
default when you turn on the machine.
ActivStitch
™
will use thread tension instead of thread metering.
Presser foot pressure (E)
pressure on the fabric.
Presser foot height embroidery (F)
or lower the height of the presser foot.
E F
presser foot and the embroidery, the top thread will
form loops on the underside of the embroidery.
Note: Because the Dynamic spring foot 6D measures the
fabric thickness continuously during embroidery, the
option to adjust presser foot height in embroidery is only
available if Dynamic spring foot 6D for embroidery is
deselected.
3:13