To remove an SMS template:
Go to Settings -> Scheduling -> Appointment Communication
Click on SMS Templates at the foot of the screen

Click Manage Templates:

Click the trash can icon alongside the template you'd like to delete:

The template will be deleted, you'll no longer see it on the list and it will no longer be available within the Message template dropdown when creating a communication trigger.
You'll not be able to delete a template if it's currently used in a communication trigger. You'll need to change the template used in the trigger first.
Go to Settings -> Scheduling -> Appointment Communication
Click on SMS Templates at the foot of the screen

Click Manage Templates:

Click the trash can icon alongside the template you'd like to delete:

The template will be deleted, you'll no longer see it on the list and it will no longer be available within the Message template dropdown when creating a communication trigger.
You'll not be able to delete a template if it's currently used in a communication trigger. You'll need to change the template used in the trigger first.
Updated on: 25 / 11 / 2020