Scrolling to a column that is not visible initially and using the Freeze Panes tool, makes the scrollbar of the Spreadsheet unusable. This valid for both horizontal and vertical scrolling. It is observable in the demos: https://demos.telerik.com/kendo-ui/spreadsheet/index
Scroll right to the "R" column. Select it and click on the the "Freeze panes" tool in the toolbar.
Alternatively, scroll down to row 30. Select a cell and click on the the "Freeze panes" tool.
As a result, scrolling the columns (respectively the rows) becomes impossible.
Consider a way to enhance the Freeze panes functionality, so that is is usable in these scenarios.