You can move, copy, and change the length of appointment in the calendar.
The corresponding options will appear when you make a right click on the appointment.
By moving appointment, you can choose a new time for the appointment.
This is done in case, if the appointment time is changed.
Copying a visit is a easy way to add a new visit to your calendar.
To extend or shorten appointment time use "Change the length"
The status of the visit must be "Inactive" during these activities!