On our 2012 Solera "S", there are three unlabeled switches just above the entry stairs, left side when entering the coach. One of those switches effects the step operation when the coach power disconnect switch is "on" (power connected to the coach). When the step switch is "on" (the switch in ours illuminates red when "on"), the step retracts when the screen door is closed and extends when the screen door is opened. When the step switch is "off" ( not illuminated), the step stays out unless the vehicle engine is started - the step retracts when the engine is started independent of the position of the step switch and independent of the setting of the coach power switch. The step also extends when the screen door is opened "no matter what" (engine running or not, step switch on or off, coach power switch on or off). (I added a switch in series with the screen door magnetic switch so I can keep the step retracted when I open the screen door should I be parked close to a curb or in some other situation where I don't want the step to extend).
Not sure if your newer coach is the same...
2012 Solera "S"
Calif SF Bay Area