Once the session is created, you cannot remove the participants of the Calibration session.
If you have added someone by mistake, you can delete that Calibration session & create a new one.
How to delete a Calibration session?
1. Go to the Calibration sessions list.
2. Find the session you want to delete.
3. Click the "Delete" button at the end of the row
4. Confirm the deletion when prompted.
5. Calibration successfully deleted.