Just like in our draw.io Diagrams editor, you can access your templates in draw.io Boards. In this video, you can see how to access the template library.
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Or learn more about diagramming with draw.io at https://drawio-app.com/learning. You can also take a look at our blog (https://drawio-app.com/blog) to always stay up-to-date on new draw.io features in Confluence.