DELETING A TEMPLATE FROM PAGES!!!
Unbelievable! Insane trying to delete a template from Pages but I stumbled upon the answer. None of the other solutions here worked on my new Mac. I have a new MacBook Pro running Big Sur 11.6. The ONLY way to delete a template in pages is to hold down the control key and THEN right-click. You'll get a choice of delete or rename! Boy O boy....what a hassle THAT was. Someone in the engineering department needs a talking to!!
MacBook Pro 13″, macOS 11.6