Gone wrong somware?
Rest my 2013 Mac book air to Big Sur to factory setting having taken off Windows 10. Which was completed by a shop (now closed) Unfortunately tried Bootcamp Assistant to reinstall the disc capacity back normal as the disc was portioned for the Windows. My Mac OS does not show on the Bootcamp app yet the portion is still there under the name of Guid Pertioned. I am unable to recover the extra space I need on my har drive. Has anyone any ideas what to do?
MacBook Air 11″, macOS 11.7