Is there a demonstration of {{ PubLink }}?

I enjoyed reading the documentation that's in the live preview however the part explaining this feature left me wondering exactly how it works and what it is used for.

Another thing I wasn't sure about was the Workspace feature. When I tap on New Workspace I am not sure how to switch back to the old one. Is it possible to switch among workspaces?

Worth reiterating that the live demo/help docs are great. Nice work!