Hi, I'm John! I will help you with this.
Can you tell me where you are seeing these users? Is it on the printer's display screen, in the HP Smart app, in your HP account, or in the printer's web interface?
If these are users that were added to the printer or HP account, they can usually be removed from the printer's user management settings or the HP account that manages the printer.
Any additional info about the issue you can provide will be helpful in diagnosing and resolving the issue.