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Observable recently launched a feature that will allow you to share notebooks without using 'publish unlisted'. Here's the documentation on the feature: https://observablehq.com/@observablehq/api-keys Using it is simple: just select "embed" from any named cell, and the modal interface will help you auto-create an API key.

Your other option would be to add guest viewers to your notebook, as long as you have a Pro team. Other than these options, you would need to make the notebook unlisted in order to share