In Excel it is possible to select several rows and increase/decrease all selected rows height. In the Spreadsheet this works only for the last selected row. The following steps demonstrate the behavior:
1. Open https://demos.telerik.com/kendo-ui/spreadsheet/index
2. Click on the header of row 6, hold and drag until rows 6, 7, 8, 9 , 10 are selected.
3. Click the handle below row 10's header and drag to increase the height of the rows. The Spreadsheet increases only the last row's height.