Check the following steps if you want to delete a template that you have created in the Notification Center.
First step:
To locate the Notification Center, you need to hover your cursor over the left part and access the Navigation Bar, then go to the Messages section, and there you will find the Notification Center.
Second step:
Identify the template that you want to delete from the templates list.
3rd step:
When you identify the template you want to remove, click on the DELETE button corresponding to that template.
4th step:
After you click on the DELETE button, a pop-up window will appear and you need to click on the newly displayed DELETE button so you can confirm the action that you want to take.
Final step:
After you confirm the deletion of the template, a confirmation message will be displayed at the bottom of the screen, to let you know if the template was successfully deleted or not.