disabled other user login screen. siera

Do you mean that you want to remove the other user account completely? If the second user is a Guest account you cannot remove that.

Choose Apple menu > System Preferences, then click Users & Groups.

Click the lock icon to unlock it, then enter an administrator name and password.

Select the user you want to delete, then click Remove below the list of users.

Do one of the following:

• Save the home folder as a disk image: Select “Save the home folder in a disk image.” This will archive all the user’s documents and information so the user can be restored later if needed. The disk image is saved in /Users/Deleted Users/.
• Leave the user’s home folder as is: Select “Don’t change the home folder.” The user’s documents and information remain and the user can be restored later if needed. The home folder remains in /Users/.
• Remove the user’s home folder from the computer: Select “Delete the home folder.” The user information will be deleted and the storage space will be freed. If you want to prevent programs that read raw data from retrieving any files, select “Erase home folder securely.”

Click Delete User.

If you don’t delete a user’s home folder, you can restore the user and the contents of the home folder.