When you use the new experience in the Azure portal, you're simply assigning qualified SQL Server licenses to Azure, as is your right. Your commitment is to use the capability compliantly. For example, only assign licenses to Azure that aren't already in use elsewhere.
If you try the new approach for centrally managing the benefit at a scope-level and decide it isn’t for you, you may opt out by removing the associated license assignments. When you remove all your license assignments for a given scope, then you're fully opted out of the capability for that scope. That means the resource-based Azure Hybrid Benefit selections are available again to the users that deploy and manage SQL resources. If Azure Hybrid Benefit was enabled for a resource before transitioning it to the scope-level managed license experience, the state is preserved for the resource. If you decide to opt out of the scope-level managed license experience, the original discounts take effect immediately.
Important
If you added Azure SQL resources within a scope using the centralized management experience and you later opt out, you must select Azure Hybrid Benefit for each individual resource for benefit application.