Microsoft's design philosophy in any of their products has gone from well organized menus to relying instead on a search bar. Copilot is a further addition to that design, with yet more pushes to never use a menu, but instead just tell it what you want and have it spit it back out. They want everything you make to go on OneDrive as well, so it can also be indexed this way. Teams works the same way. The big search bar at the top is unavoidable.

Windows search is complete garbage, which you might think is a counterpoint, but instead it's just that they only put work into having it serve results for cloud-indexed items or web results.