Scroll the list to ensure that the list fits your needs.
It is also possible to define single record filtering by checking or un-checking the combo box visible in the left-most column.

Note:
A context menu is displayed when you right-click over one of the check boxes. It enables you to select all the records, deselect all the records, or toggle the select state of the records.

At this point by clicking the Next button, the data will be actually loaded and associated with the selected label group.