Hi @Guilherme Poggi
Thanks for the question and using MS Q&A platform.
According to this documentation: Switch back to classic portal
Even after upgrading to the enterprise version of Microsoft Purview, you can switch back to the classic portal at any time using the toggle.
Linked resource - The enterprise version of Microsoft Purview is hosted by a linked resource in the Azure portal. If you delete this linked resource in the Azure portal, you lose all your Microsoft Purview information.
After deletion, you can reinstate the free version for your environment if it's been enabled for your organization by going to the Microsoft Purview portal. But you're starting your environment from scratch.
For more details refer to this: Upgrade from the free to enterprise version of Microsoft Purview governance solutions
Hope this helps. Do let us know if you have any further queries.
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