In the grid controls in the upper right corner, select
Show Group Panel
to open the heading pane.
A label
Drag columns here to create Groups
appears above the column headers.
Drag the column headings you want to group into the area next to
Drag columns here to create Groups
.
A grouping automatically displays a total for the grouped column. For example, a group by entity name shows the total number in the list per entity name.