Hello M. Abdallatif,
Greetings and Welcome to Microsoft Q&A! Thanks for posting the question.
With the latest GA version, sharing is no longer required. You can see an option to view all v4.0 projects at the bottom of the My Projects page. Ensure the user has access to the same Azure account and Document Intelligence resource, and they should be able to view the project under All Projects. This update will likely be added to the documentation soon.
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