This app is using Static data, imported Excel tables.
So I'm not sure if this Is this the default behaviour for this type of app or not.
I can manually add a DataCard and form fields but it does not auto populate the form as expected.
Steps to repeat issue:
Place a Display form control on the canvas
In the Options panel, select the No datasource selected.
Selecting the datasource , no changes in Options panel
Go to advanced tab, data source is present ? but the Options tab remains unchanged.