Clear "Other Volumes" storage in Disk Utility I have around 7 GB of stuff labeled under Other Volumes in my disk. What is using the storage reported under Other Volumes in Disk Utility and how to remove it?

I am running macOS High Sierra.
No, you can't remove it.

Along with the startup volume on which the macOS is installed, there are additional volumes which are created and used by your Mac. These other volume(s) are hidden and some of them are not even mounted.

To list the volumes, run:

diskutil list

The occupied storage space of all such hidden volumes is aggregated and reported under Other Volumes in Disk Utility.