Microsofteuburrag Funny you mention that, since look what just appeared today (see below). Interestingly, that feature just randomly and completely unannounced (at the time) appeared for Insiders some weeks ago, but I guess it was decided that the public at large should be buffered from it to some degree. It's https://answers.microsoft.com/en-us/msoffice/forum/all/outlook-search-bar-moved-to-the-title/69ebb63c-30fd-478b-ab52-8919d4a5d418 hugely popular in some circles.
https://www.microsoft.com/en-us/microsoft-365/roadmap?filters=&searchterms=53775
Outlook for Windows: Search at the top
Use the Coming Soon preview option to experience Search to the top of your screen, combined with Tell Me What You Want To Do. Suggested emails and files are included once you tap into the Search box to align the experience with Microsoft Search.
