Currently, a data source that resides on SharePoint shows in the list of data sources with only the list name. This makes it difficult to work out what SharePoint site collection or site hosts the list.
Please add functionality that shows the full URL of the SharePoint list in a data source.
If you open the data panel from within the app, you'll see the "Edit Data" link under the name of the data source from SharePoint. With customize forms you'll also see the full link in the back stage of the app (using the File Menu).