Turn off data source simulation when you are ready to use your actual system of record.
If a live source is already configured, it is made available, that is, turned on. If you do not have a live source configured, you can define a new REST source.
In the navigation pane of App Studio, click Data.
Click Data objects and integrations.
Click the data object for which you want to turn off simulation.
Click Data views.
If the data object has more than one data source, click the data source that you want to turn off.
If the data object source does not have a non-simulated source configured, create it by clicking Create.
Result: Follow the prompts to create a data source.