Select Static scheduling to force appointments to be made only at fixed times based on "blocks" equal to the duration set in the "Minimum appointment time" setting, taking into account the assigned buffer time. For example, if your minimum appointment time is set to 60 minutes and you have a buffer time of 10 minutes, and a patient books a 30-minute appointment at 9:00 AM, your next available appointment will be at 10:00 AM. This is because: your minimum appointment time is set to 60 minutes, so Halaxy will not allow another booking until the 60 minutes is up; and a buffer time of at least 10 minutes is required between appointments, but there was a 30-minute buffer time, so a new appointment can be made.
Select Dynamic scheduling to allow appointments whenever you have an available time slot, ignoring the "Minimum appointment time" setting but taking into account the buffer time between appointments. For example, if you have a 10-minute buffer time and your have a 30-minute appointment at 9:00 AM, your next available appointment time will be 9:40 AM. This is because Halaxy will enforce the 10-minute buffer time between appointments.