Hi Hajir,
Greetings from Syncfusion support.
We have analyzed the scenario, and we would like to inform you that, this is the default behavior. As there is no space to contain the rendered validation tooltip messages inside the Grid content area, scrollbar is rendered to display the validation messages.
When Height for grid is not provided, grid’s content area will be based on available rows in grid. Now only single row space is available in Grid, and there is no space to show the rendered floating validation message tooltip inside Grid area. So, the scroller is rendered and it automatically scrolls down to display the validation tooltip message.
We have prepared a video demo showing, the scrollbar automatically scrolls to display the validation tooltip. And once valid values are shown, the scroller disappears.
Please get back to us if you need further assistance.
Regards,
Renjith R