Change appleid
I gave my Mac book pro with user name macuser to my wife and see need to use her Apple ID to this device
MacBook Pro 13″, macOS 11.4
Click on the link to read 'What to do before selling or giving away your Mac.' --> hhttp://support.apple.com/HT201065
For your wife:
Click on this link to learn how to 'Sign in with your Apple ID' --> https://support.apple.com/HT204053