Deleting pages template
How can I delete template in pages I created, tried to look for in Library but couldn't find it?
MacBook Pro 15", macOS 10.14
Launch Pages. In the template chooser, visit the My Templates category in the sidebar, and then control-click on the template that you wish to delete. A secondary menu will appear offering Rename and Delete.
If you did not save the template into the Template Chooser, its anyone's guess where it is now. Look in iCloud.