Hi @Kathy Rivers ,
Typically, you can go to the View tab in Outlook and click on Show Focused Inbox to re-enable it.
If the option on the View tab to turn on or off the Focused Inbox also disappears, you may need to refer to the Focused Inbox disappears when you switch folders in Outlook.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.