The requested functionality cannot be configured for the Spreadsheet component using its API. I've tried to workaround the built-in functionality but I cannot provide a solution that works in all scenarios that I've tested.
I've logged a feature request on your behalf about the currently discussed functionality. Here is the link to the feature request: https://feedback.telerik.com/kendo-jquery-ui/1464763-disable-the-sheets-tabs-reorder-in-spreadsheet. You can vote for the request. The more votes a given request collects, the bigger the chance for its implementation is.
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