1st Step: Create an appointment by not allowing the choice of teacher.
In My Studio > About Appointments > Create or modify an appointment > Fill in the form > Indicate all the teachers who offer this appointment > Deselect "Allow the choice of the teacher when booking".
2nd Step: Assign a teacher after the student has made a reservation.
You will receive a notification that a student has made a reservation and needs to be assigned a teacher.
Click on the arrow in the red framed message. You will arrive at the customer's appointments.
Click on "Assign to a teacher".
Choose the teacher you want to assign.
The teacher is assigned to the appointment.
For more information regarding other tabs of the appointments, go to the products section of the Help Center.