I’m a Premium licensed user.
We are in need to have sorting for flat view?
Can you please let us know how to achieve this?
Thank you for pointing this out to us and for providing JSFiddle examples for illustration.
We would like to confirm that the behavior you described is not the expected one.
Our team is working on a solution to these issues and the fix will be available in the minor release with the ETA June 17th.
Please let us know if you have further questions.