This article explains the steps for deleting a Lightning email template in Salesforce if you have the correct permissions.
Note: The steps given in this article apply only to Lightning Experience email templates. Before you delete any template, please ensure that you do not need the template any more and if you might, then make sure to save the information in the email template as a backup.
Considerations for Using Public and Private Email Templates in Lightning Experience
Manage Public and Private Email Templates in Lightning Experience
Trailblazer Community - Mass Deleting Email Templates
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