This is guide for delete agents from Empty Group at regular interval.
1) Log in to Policy Admin.
2) Click Domain Settings.
3) Go to the Grouping tab.
4) Click Empty Group Settings.
5) Delete agents from Empty Group at regular interval:
Specify the interval to delete from the empty group. You can enter from 0 to 99999.
The example below is a setting that automatically deletes after 7 days.