Hi Cezar,
Thank you for contacting Syncfusion support.
We have analyzed your requirement “Picker doesn’t work on WSA” and the DataForm PickerEditor will support only on Android an iOS and for UWP you can use DropDownEditor instead of Picker, we have mentioned the same in our UG documentation.
Kindly refer our UG documentation for more about PickerEditor in dataform by refer the following link:
We hope that this helps you, kindly revert us if you have any concern.
Regards,