Grids such as the Indicators or Manage Meta Data enables grouping together of displayed data. The grouping option gives you a different way to aggregate the underlying data.
To group the data, drag a column header to the area at the top of the list. A set of double arrows appear, indicating where the column will be placed.
Dragging a column header to the grouping area causes the display to change. The data is aggregated by that column and redisplayed.
In the screenshots below, the results are being grouped by the Collection column. Once the action is complete, the display updates to show indicators grouped by the collections they belong to.
Grouping Data by Dragging and Dropping Column Headers