Thank you for contacting Syncfusion support.
Based on the shared information, we have analyzed the reported issue “DataForm doesn’t display within StackLayout” and we suspect that you have not specified VerticalOptions for DataForm. If you want to load DataForm inside StackLayout, you need to Horizontaloptions and VerticalOptions of DataForm and set Parent (StackLayout) of DataForm to LayoutOptions.FillAndExpand.
Kindly refer our UG documentation to know more about loading DataForm inside StackLayout,
We hope this helps. Kindly revert us if you have any concern.
Subburaj Pandian V