Please know: There are no Microsoft employees here, and none of us have access to Microsoft employees. This forum is made up of Windows users trying to help each other.
Having established that, here are your options:
1- Tell your fellow Windows users how much you hate this - accomplished.
2- Find a third-party File Explorer replacement from a reputable developer.
3- Learn to accept the Windows 11 File Explorer as-is.
4- Work with Files Explorer's own settings to achieve an appearance that is acceptable to you.
5- Make a suggestion to Microsoft in the Feedback Hub.
6- Try a different operating system with a file manager more to your liking.
You also have this option, but I cannot recommend it:
7- Attempt to change the appearance of File Explorer by unsupported methods like the Windows registry, command lines or so-called optimization software. In my experience, this never works well in the end.