By default, the GridGroupingControl does not have direct support to ReSizeToFit the multi-line text. It can be displayed only by scrolling.
To ReSizeToFit the multi-line text, a workaround solution in the QueryRowHeight event is available. In this event, the cell’s height has been calculated as per the current cell value along with the number of lines.
Note: Since, the height has been calculated in QueryRowHeight event that triggers frequently, the row height cannot be resized.
Figure 1: Multi-line text ReSizedToFit
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