Hi Piotr,
We have checked with your query regarding SfDataForm not arranging properly when SfDataForm is added along with other control in the stackLayout in Xamarin Forms. We are not able to reproduce the issue in our side. However, for Xamarin Forms platform, if dataform is added in StackLayout, dataform VerticalOptions and HorizontalOptions need to be set as FillAndExpand to layout. Based on the provided code snippet, we have prepared a sample for the same. Kindly find the sample below,
Could you please check with the provided sample whether the mentioned issue is reproduced? If not, kindly modify the sample attached and revert us back with more details regarding your query. Such that it will be helpful for us to provide you solution.
Regards,
Swathi G