Every person is enrolled in a class and/or it doesn't appear in the Add To Group dropdown list.

Every person is enrolled in a class and/or it doesn't appear in the Add To Group dropdown list.

The group/class is most likely setup as a "Worship Attendance" group.  This setting allows anyone in the database, without being on the roster of the group, to be checked present.  This option should only be used for actual worship service attendance and not children's classes etc..  To fix this, go to the group/class, click on the blue edit button, then click group information.  Uncheck the worship attendance group option on this page.

To add a group to the dropdown list, go to the check-in view page (check-in then check-in view) and click groups in the column beside the check-in view you are wanting to add a group to.  Select the group/class you want to add.