Only email templates in the category "Employees" can be assigned specific filters.
When creating an "Employee" email template (under "Settings" - "Email Templates" - "Add new item"), you can tick the box "Use filters for the email template".
The filter field will then appear, and you can add specific filters for this template.
If you still have questions after reading this article, don't hesitate to contact us by submitting a ticket.
We're always happy to help ! :)