The first Windows 11 preview build was released yesterday with a variety of bugs that are sure to frustrate testers. Most of the bugs have been easy to fix so far and should get you back up and running with Windows 11. Windows Insiders can’t install Windows 11 due to missing hardware requirements. Microsoft is aware of some other noticeable issues but has not provided a fix for them as of yet. Windows 11 File Explorer reverts to what I call the ‘Classic’ skin from Windows 10.
Source: https://www.bleepingcomputer.com/news/microsoft/the-known-windows-11-issues-and-how-you-can-fix-them/