Using Classic Outlook on Windows for personal email, calendar, and contact management
the update corrected my issue.
thx win team...
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A new "App Search" field has appeared to the right of the normal Search field. I can't seem to find any information on the articles explaining what this is or how to remove it. The "App Search" field also doesn't do anything. You can't type anything where it says App Search and nothing happens when you click the magnifying glass. A couple of things that have already been attempted:
Using Classic Outlook on Windows for personal email, calendar, and contact management
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the update corrected my issue.
thx win team...
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This answer has been deleted due to a violation of our Code of Conduct. The answer was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.
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The latest update has fixed this!
Last Updated: February 2, 2024
ISSUE
After updating to Version 2402 Build 17231.20182 Outlook now unexpectedly has an App Search bar above the message list. Depending on how you have the Reading Pane set this may crowd the Search box.

STATUS: WORKAROUND
The Outlook Team has implemented a fix for this issue and currently anticipates it to go out in the February 13th public update. We will update here if that changes.
Workaround 1:
If you need to work around the issue to be able to search, you can set the Reading Pane to the bottom by clicking View, Reading Pane, Bottom or to Off.
Workaround 2:
If you urgently need to remove the App Search Bar you revert to the build before the issue started.
Revert the Office M365 Click-to-Run installation to Version 2312 Build 17126.20132.
To do this:
cd %programfiles%\Common Files\Microsoft Shared\ClickToRun
officec2rclient.exe /update user updatetoversion=16.0.17126.20132 4. When the repair is done, open Outlook and selectFile > Office Account. 5. Select Update Options and choose Disable Updates. 6. Add an appointment on your calendar for after February 13th to check back to this topic to confirm the issue is fixed. If it is re-enable updates by clicking File> Office Account > Update Options > Enable Updates.