After a while you will (or may not) hit the max limit of templates. This is where you find the delete button for all the different kind of templates you can create in Favro.
Remember! Deleted templates can not be restored.
Deleting templates using the template editor.
You can delete card, board and collections in the Template Editor. You can get to the template editor in the top left of your organization.
If you want to read more about how to manage templates, you can do that here.
To delete a template you can press the three dots next to it's name and then delete.
Simple as that! If you rather want to know how to create templates, please refer to this article.