This is Microsoft’s new modern File Explorer overhaul for Windows 11
As was revealed a handful of weeks ago, Microsoft is currently working on a significant update to File Explorer on Windows 11 that will update several core areas of the app with modern designs and new features that will better integrate the experience with OneDrive and Microsoft 365.
[...]The home page itself is being updated with more integration with Microsoft 365. Along the top will be a feed of recommended" files, which will be presented with larger thumbnails that will make it easier to see what files are being suggested to you.
That's a lot of excuses for ads.