Mac admin account shenanigans

When I bought my iMac a couple of years ago, I used Migration Assistant to set it up from my old MacBook. But that laptop used my wife’s account as its primary user, and that was transferred across to the iMac. Each time I start up my iMac, it opens in my wife’s name, and I have to log out and back in to access my account. How can I adjust the iMac so that mine is the main account, and my wife’s account is removed? Howard Oakley replies: The first admin user account that’s created is special in macOS, so although it’s possible to fudge things in the Users & Groups pane and in Terminal, it’s far better to make the necessary changes by setting up from a clean installation of macOS. Ensure that your iMac is fully backed up, preferably keeping an extra copy of important documents, including your keychain. Keep the backup ready with a high-speed connection to your iMac, then restart in macOS Recovery (hold ‘Command-R’ at startup) and use Disk Utility to erase the startup disk, then install macOS on it, making yourself the sole and admin user. During setup, use Migration Assistant to transfer just your documents and settings from the backup.