Deactivate and Hide User accounts on Mac OS
- always reboot after changes
- keep a backup account and remember your user name
ls /users
chsh <username>
This will switch between showing the Account Image and the Option "Other user" where you need to type username and Password
sudo dscl . create /Users/<username> IsHidden 1
sudo dscl . create /Users/<username> IsHidden 0
This will completly hide the account from the Login Screen. You need to have a second account to reactivate the disabled account
sudo chsh -s /usr/bin/false <username>
sudo chsh -s /bin/bash <username>