Hi @darrcie,
Greetings from the Roku Community!
We understand and appreciate you reaching out about this setup. Yes, you can actually set up your Smart Home app on different devices as long as you use the same credentials. When you say "disappeared," have you tried reinstalling the app and restarting your device, then trying again to see if you're still seeing the same issue occur?
Or let us know more about this so that we'll be able to provide you with the appropriate next step.
Thanks,
Rey
ERey.
Roku Community Moderator