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I somehow suspect that what you’re calling the admin bar may well have been what login/logout was displaying.

was this admin bar at the top or bottom of you screen, and what did/does it display ?

Try adding them back one at a time and see if it comes back.

and next time don’t delete, just deactivate, then you can go back if needed 🙂

or note down exactly what you have taken away so that you can add it back !