In order to have an overview stating which of your participants actually took part in your course, you can simply record their attendance.
To do this, click on "Start" on the left side in FitogramPro and click on the event for which the attendance is to be marked. For the booked-in customers, you will see a Check-in button.
Simply click on the button to mark a customer as present
If one of your participants does not come to a booked lesson, you can mark them as "Absent" by clicking on the dots near the Check-in button and then selecting Absent
If you book in the customer manually, they will immediately be marked as "Present", because then they are most likely standing in front of you to have booked the course.
If a customer books in online, they will not be marked as "Present" or "Absent", as it is not yet clear whether they are actually participating in the course.