What is the Data Card formatting that you are trying to keep? Did you mean like the control types inside Form? If so, your requirement cannot be achieved so far. It is by design that if you change the data source of the Form, the controls inside would automatically change according to the column types in the new data source.
Community Support Team _ Mona Li If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
I'm referring to every property inside the data card:
Label.Height, .Width, .FontWeight, .Font
Star.Visible, .Size, .Color
I go through significant efforts to customize the contents of a Data Card but for some reason, all that customization is tied to the Data Source. I believe we would all benefit greatly from separating Data Card formatting from the Formulas and Parent.Everthing.
The biggest use case is when someone comes to me and says: "Thats the wrong Sharepoint list, we need your app to point over here.", or "We'll just move it to SQL in the future." I have to say, "Its not that easy".