Deleting Backup Plans From Passport Ultra

When I attempt to delete older backup plans from My Passport Ultra drive, the folders/files remain. I really don’t want to format the drive, reinstall the backup software and create a new backup plan. I’ve searched for this answer and can’t find the solution. Am I doing this correctly?

Hello,

What backup software are you using?

I finally erased the drive and reinstalled the software. All software downloaded was the current versions. Everything is working perfectly. Thank you for your concern.