Leaving a gap between appointments

I’m sure when we were first setting up Cliniko that there was an option to leave a gap between appointments (say 15 mins) but I can’t seem to find out how to do this now. Did I imagine it? Is there a way to do it other than making all appointments longer? Am I going crazy?!

In the settings for each practitioner it says ’ Default appointment type

When creating a new appointment for this practitioner the appointment type will default to this choice. The duration of this appointment type is also used to set the amount of time between the time slots offered to patients in your [online bookings] calendar.

So it MUST still be a thing!!