Microsoft enabled the focused inbox in a recent update to Outlook, the steps below will show you how to turn this feature on or off.
Turn Focused Inbox on or off:
- In Outlook, select the View tab.
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Select Show Focused Inbox.
This article from Microsoft that provides more information on the Focused Inbox: https://support.office.com/en-us/article/focused-inbox-for-outlook-f445ad7f-02f4-4294-a82e-71d8964e3978