As described in https://docs.telerik.com/kendo-ui/api/javascript/ui/textarea/configuration/overflow, the TextArea widget supports customizing it's overflow behavior. However, setting this option to e.g. "scroll" has no effect as can be seen in this DOJO: https://dojo.telerik.com/etapAfaC.

If you check the applied styles in the browser's DEV-Tools, you can see that the internal class "k-input-inner" overrides the value set using the overflow option.