I have tested the described behavior and as demonstrated in the attached recording, it works properly.
Please check in other browsers if the behavior is the same and also verify that there are no JavaScript errors in the browser console that would prevent the correct behavior of the Spreadsheet.
Regards,
Peter Milchev
Progress Telerik
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Thank you for the response and recording. It was not apparent that the user needs to highlight the area prior to using the high level sort buttons at the top.