Hi Axel,
Thanks for contacting Syncfusion Support.
We were not adapt Xamarin.Forms.ScrollView in our SfDataGrid since some shortcomings like two-way scrolling not possible in default ScrollView at the time of development. Instead, we have used custom scrollview in order to achieve two-way scrolling. So, at present, it is not possible to add scroll bar at runtime.
However, we have already logged the report to adapt Xamarin.Forms.ScrollView for windows platforms and the support will be available in any of our upcoming releases.
Regards,
Divakar.