If I assume your Kwikee steps are continued by more traditional steps up into the motor home then the step switch, which is either called a POWER switch or an OVERRIDE switch, depending on the age of your coach, should be on one side or the other of the steps inside the rig.
However if all else fails then with the steps OUT crawl under the rig
You will find the controller on the bottom of the step mounting bracket
Now... Coming out of the controller should be a 16AWG white wire (If it is a new style controller) trace them.. You should find a switch. That's the OVERRIDE switch. Turning it ON should lock the steps in the OUT position, turning it OFF makes the steps follow the door.. NOTE> if the white wire has been jumpered to one of the other wires.. say a red one.. Then your switch is always on and this is very simply not a proper install.
Again this assumes the unit is a newer one
Older ones the switch is called a power switch and it must be on for the steps to follow the door.. I can't find my copy of the old service manual just now so I don't know for sure the colors of the wires on the older "Squarish" controller
(The new controller is 4-sided but looks almost triangular)
Home is where I park it!