Hi balloonie,
Welcome to Microsoft Community.
Changing the functional area of File Explorer back to the style of Windows 10 can be achieved by modifying the registry. I will list the operation method below for your reference:
- Click the search button on the taskbar and open it. Type "Regedit" to open the registry editor
- In the path bar, navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions and check on the right to see if there is only one "default" value.
- Create a new "item" by right clicking on the blank space. Create a new string to the right of the new item, and name it {e2bf9676-5f8F-435c-97eb-11607A5BEDF7}
- Restart your computer to see if the functional area is restored
Disclaimer: Generally, modifying registry subkeys or work group is intended for advanced users, administrators, and IT Professionals. It can help fix some problems, however, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For further protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click here to view the article.
Please feel free to let me know if you got any further updates, thanks
Best Regards,
Manson - MSFT | Microsoft Community Support Specialist