Linux Mint--I've unmounted an ISO, but it still shows under Devices in the File Manager. How can I remove it?

I mounted the ISO through VLC, by right-clicking and choosing VLC as the application to open it.

I unmounted the ISO by right-clicking on the icon on the desktop and choosing unmount.

The ISO still shows under Devices in the file manager after I unmounted it, how can I remove it? The ISO file no longer exists.

Thank you.