Hi @Roger Roger ,
Welcome to the Microsoft Q&A platform!
Based on your description, it looks like something has changed with the search feature in Office 365. The search box (called Microsoft Search) has been moved to the title bar of various Office applications, including Outlook. This change is designed to provide a consistent and superior search experience across all Office 365 applications.
If you don't see the search box, it may be collapsed by default. You can enable or disable it by going to the File menu > Options > General tab and checking or unchecking the option to Collapse the Microsoft Search box by default.
If you're still having issues, it may help to clear your browser cache or try accessing the site from a different browser to see if that resolves the issue.
Please feel free to contact me for any updates. And if this helps, don't forget to mark it as an answer.
Best,
Jake Zhang