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To set column width to fill the total width of grid, You can use the AllowProportionalColumnSizing property.
Please refer to the Kb to set column width as client size.
this.gridGroupingControl1.AllowProportionalColumnSizing = true;
For more information please refer the below link,
Thank you for your update.
Customizing column widths in GridGroupingControl
If you want to customize the column width of the grid, you can QueryColWidth event.
this.gridGroupingControl1.TableModel.QueryColWidth += TableModel_QueryColWidth;
void TableModel_QueryColWidth(object sender, GridRowColSizeEventArgs e)
To resize the range of columns or rows to fit the contents of specified range of cells , you can use ResizeToFit method of ColWidths and RowHeights respectively.
Please make use below code.