Folders and Enhanced Sharing in Lightning Experience
Use folders and enhanced sharing to let users decide who can use which email templates.
Otherwise, all email templates are public and available to all users.
Required Editions
Available in: Lightning Experience
Available in: Professional, Enterprise, Performance,
Unlimited, and Developer Editions
Select Which Users Can Create and Share Email Template Folders Admins and any users with the Modify All Data permission can create email template folders. To let other users create email template folders, give them the Create Folders for Lightning Email Templates permission.