There may well be no adjustment.
Kwikee steps use a current sensor. when the motor "Stalls" the current increases and the controller shuts off
IF Same on extension when teh steps hit the stops (Those may be adjustable) the motor stalls and power is removed.
The other "Stop" is the curved arm. with steps extended you will see a curved arm attached to the transmission then a straight "link" to a bell crank that extends the steps.
Now do not be under the steps when they move but is the curved rod swinging all the way back and hitting the transmission housing. It should