KateMatilda wrote:
I can't find the other users in my MacBook in both the login menu and the quick user switch tab. But in the users and preferences settings, you can see that I have more than one user in this MacBook.
[Re-Titled by Moderator]
What precipitated the issue...is that other admin your old admin, did a new admin get created when you tried to upgrade your machine (?)
What happens if you log out of your current admin/user
>Log out
Your Guest user is not enabled so that leaves you just 'one' other.
You can enable guest user from >System Preferences>User & Groups
this is good if your mac is lost or stolen, allowing a guest to log in and get on line— in this way you can track it.
Delete a user or group on Mac - Apple Support
Set up users, guests, and groups on Mac - Apple Support
Change Users & Groups Guest user preferences on Mac ...