On the main screen of Amazing Charts, click "View" -> "Administrator Options" and enter the ADMIN password when prompted.
Select "Scheduling (Setup/Edit)"
Click Set Appointment Types
On the right-hand side, you will see Schedule Increment (for this computer only)
Select the desired increment and click "Set increment"
Close out of the Admin Options and restart AC, you will now see the changes reflected
PLEASE NOTE THIS WILL NEED TO BE DONE ON ANY AND ALL COMPUTERS YOU DESIRE TO REFLECT THIS CHANGE.