You mean the status in the dashboard tile? Change the definition( ... ) to
definition (name: "Simulated Alexa Switch", namespace: "bjpierron", author: "bjpierron", mnmn: "SmartThingsCommunity", vid: "e7139f27-316b-3400-80be-9581014a7434" )
If you want the icon to change as well, you can change the end bit to:
vid: "e7139f27-316b-3400-80be-9581014a7434", ocfDeviceType: "oic.d.switch" )
Forgot to mention to make the app take notice immediately, edit the device in the IDE, change something significant like the device name or the device label and then ‘Update’.
Update: Just noticed the oic.d.switch mod was in the original post. I had pulled the original DTH.