Explanation
The SetOrdinal method of the DataColumn class can be used to change the index or position of an existing column in a datatable. The method takes an integer argument that specifies the new ordinal or position of the column. For example, to move the first column to the last position, one can use: yourDataTable.Columns(0).SetOrdinal(yourDataTable.Columns.Count - 1). (UiPath Automation Developer study guide) References:
DataColumn.SetOrdinal Method
How to move Column from Index 0 to Index 10 in datatable