Hi Jayamal,
Do you mean Search tab does not appear when you click in the search field? Have you made any changes to Outlook before this issue happened?

Please try adding the search ribbon manually to see if there are any improvements. To do this, please go to File > Options > Customize Ribbon. In Choose commands from, select Tool Tabs. Select Search on the left and click Add to place Search ribbon
after the Home tab when viewing all folder types.

Any updates, please tell me for further assistance.
Regards,
Perry Pan
Please remember to
mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact
tnsf@microsoft.com.
Click
here to learn more. Visit the dedicated
forum to share, explore and
talk to experts about Microsoft Teams.