Hopefully someone can help.
I updated my late 2013 iMac to Catalina but I had to revert back to the last saved backup on Time Machine (Mojave 10.14.6) because of a printer problem that i needed working immediately.
Anyway, when the re-install was finished a new drive called "Macintosh HD1" was on my desktop. I ejected it and it was gone until I turned the computer on again. I'm not sure how I created it and I just want to delete it somehow. Attached are screenshots of the Info windows.
I renamed it "???" so i wouldn't harm the REAL volume Macintosh HD. Thanks!