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New vs Classic Outlook Feature Differences
Microsoft has deployed New Outlook but still allows Classic Outlook to be available. However the two "views" have different feature sets.
Here is the Microsoft KB article that fully documents the current differences in New and Classic Outlook: https://support.microsoft.com/en-us/office/feature-comparison-between-new-outlook-and-classic-outlook-de453583-1e76-48bf-975a-2e9cd2ee16dd
You can also view Microsoft's Roadmap for updates: https://www.microsoft.com/en-us/microsoft-365/roadmap?searchterms=new+outlook
How to Toggle between new and Classic Outlook: https://support.microsoft.com/en-us/office/toggle-out-of-the-new-outlook-for-windows-ec102b39-5727-418e-ae1f-a1805434640c