On my desktop, I have a 'storage' icon which I don't recall ever using. Where is this located? Thanks in advance.
APFS = Apple File System. It's Apple's replacement for Mac OS Extended (HFS+). So you didn't mention what desktop you have, but I assume you should only have a single drive inside. You are running a much older version of macOS than I am, so Disk Utility displays things a little differently. If you have nothing stored on that Storage volume, you should be able to simply click the - button up on the menu bar where it says Volume to remove it. However, before doing so, I absolutely recommend doing a full backup of everything "just in case". But you should be good to go.Thanks. What does APFS stand for?