Add index, to create a new index.
The name of the index will be generated automatically from the name of the current data group and an
incremental number, and will be added to the list on the left.
Remove index to reset an existing index. The index will be removed from the list.
Select field you can select a field from the list and specify a sorting order.
If the field contains unique values, the setting Index is unque can be selected to improve the performance when filtering or sorting.
Remove field to remove a selected field from the list.