This new Checkin Control Report is accessed from the Organization Search page and is under the Export/Reports menu. The report is a list of everyone who has been marked present in any of the classes for which you have filtered. You must select a  Schedule , even if you do not specify a Program or Division. When you select this report from the menu, you then specify a date and click Run. 

Use case:

At a certain point after everyone has checked in for a specific schedule, you can run this report to have a master list of everyone who has checked in that day. 

For example: If you filter for the Program - Life Groups ; the Division - Children ; and the Schedule - Sun 8:00 AM , you could run this report sometime after 8:30 or 8:45 or whatever time you think people will no longer be checking in for that hour. The report will list everyone who has checked in to any of those classes.

Click  HERE  to read more.