When you open an email's menu in the dashboard, you will see the "Publish as a template" option in the menu.
Click the menu point.
It turns into a template. There will be an icon that signals it is a template in the upright corner of the email card.
You can unpublish it in the same menu using the "Unpublish email template" menu point.
To use it as a template, when you want to create a new template, click ''New email'', and then ''Select from workspace templates''.
There you will find the email that you saved.