Hi,
Kayece here, An Independent advisor and a user just like you. I will be happy to assist you today.
I understand that you are unable to eject your USB Hard Drive since there is no option shown when you right-click on it. USB Hard Drive or portable hard drive is not a removable drive like a USB flash drive. It can only be ejected from the icon in the taskbar. Can you check if there is a Task Tray 'Safely Remove Hardware and Eject Media' option in your taskbar?
Stay Safe!