Clears the grouping applied to the View and returns the group columns to display in the View.
NuGet Package: DevExpress.Win.Grid
The method clears grouping and adds the group columns to the end of the ColumnView.Columns collection.
If you need to cancel grouping by a particular column, set the column’s GridColumn.GroupIndex property to -1. In this case, the column is hidden from the View. Use its GridColumn.VisibleIndex property to show it again.
Please refer to the Grouping topic for additional information on grouping data.