The "Demo" Account available in the app will be a quick preview of how the app works with devices added. Right now it is quite limited in its functionality as it will only show a single Gen 2 device with a few circuits added. If logged into the Demo account (picture shown below), you can log out by tapping the menu icon (three bars, upper left corner of the app) and go to Account - then logout. That will allow you to login with your own account and have everything back to normal.
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This knowledge base is pretty new for the Emporia team. Our goal is to provide all of the information we can to help you manage your energy in better ways. If this article wasn't helpful, or we could be more clarifying on any points please reach out to the Customer Support team and we'll certainly work to improve these guides.