After deleting VirtualBox, the 50GB of space it occupied was not freed up.

[Zexanal]

I created a virtual PC with Windows 10 installed through Oracle VM VirtualBox and allocated a fixed 50GB of storage for performance. Later, I needed this space, so when deleting the virtual machine, I clicked on the option to "delete all files" before removing it. However, before deleting, I had 116GB of free space, and even after deletion, I still see 116GB of free space. I am sure it originally occupied 50GB of space during installation. I tried restarting and completely uninstalling the application from my PC, but the issue persists, and I couldn't find a solution anywhere. Currently, 50GB of space is unnecessarily being occupied. I also use Windows 10 on my own system.