You can resize the appointment in 3 ways:

Please see the “RESCHEDULING THE APPOINTMENT” section of the User Guide for details on using the “Move” option.

Resizing the appointment using click and drag

On the bottom of each appointment box is a rectangle area displayed with a slightly darker colour from which you can click and drag to modify the appointment duration:

Left click and move the mouse up (less time) or down (more time) while holding the mouse button:

Release the left mouse button when the desired time has been reached:

Resizing the appointment using the “End Time” option

From the “Appointment Details”, click on the “End Time” field and select the required value:
Confirm the resizing by pressing the yellow “Update” button.