How do I take one of my Macs off iCloud?
How do I remove one of my devices from the iCloud?
MacBook, macOS 11.6
Question marked as
Sign in with Apple ID account credentials at appleid.apple.com from a browser .
Select devices .
Again click on the Mac icon that has to be deleted and click on remove from account .
See the articles Check your Apple ID device list to see where you're signed in - Apple Support
View and manage your Apple ID trusted devices on Mac - Apple Support
See and remove your devices that are associated with Apple ID purchases - Apple Support