Frontier, the manual is right...only in this one case
Turn the adjuster knob all the way counter-clockwise to go to the lowest setting...full soft setting.
Most of us have been finding that only 1 or 2 full turns out from the lowest setting is where we have ours adjusted.
Considering that the adjuster will turn a full 19 turns clockwise...to the full FIRM setting, that shows that we are using about 5% of the adjustment range for our riding.