These commands should be used in an elevated / administrator command prompt or PowerShell.

Set old / original menus as default.

reg add "HKEY_CURRENT_USER\SOFTWARE\CLASSES\CLSID\{86ca1aa0-34aa-4e8b-a509-50c905bae2a2}\InprocServer32" /ve /f

Remove Explorer command bar

reg add "HKCU\Software\Classes\CLSID\{d93ed569-3b3e-4bff-8355-3c44f6a52bb5}\InprocServer32" /f /ve

Restart Windows Explorer

taskkill /f /im explorer.exe
start explorer.exe

You can follow the following steps to restore the new context menus and command bar. Beginning with restoring the Windows 11 context menu.

reg.exe delete "HKCU\Software\Classes\CLSID\{86ca1aa0-34aa-4e8b-a509-50c905bae2a2}" /f

Restore the Explorer command bar

reg.exe delete "HKCU\Software\Classes\CLSID\{d93ed569-3b3e-4bff-8355-3c44f6a52bb5}" /f

Restart Explorer

taskkill /f /im explorer.exe
start explorer.exe