Documents in the Document Grid can be filtered by any field visible in the grid (see Field Chooser for adding fields to the grid). When the grid is filtered, a filtered icon will be shown in the status bar (see below) to indicate not all documents are shown.
To apply a filter to a field in the grid, select the filter icon in the fields header. A dialog will appear (see below) will possible values to filter on. Simply check or un-check items in the dialog to apply filters.
If the user requires more advanced filtering options, use the Custom Filter (see below) option to add specific filters.
To remove all applied filters, right click anywhere in the grid and select "Remove All Filters".