Delete a backup set in the cloud of old computer

In the Norton cloud area of backups I see several backup sets (DefaultSet), some from old computers no longer used. How can I delete these old sets, but keep the current set.

In Windows Explorer I see a number of backup sets (on my own NAS) and one with the title "Docs to cloud from this computer on Secure Online Storage". However, when I try to open it, I get the revolving circle (busy) and a green line at the top in the location, but I don't get a result. I was asked to log in (which I did). The name also gives the impression it is one of the sets, that of the current computer.

In the cloud I do have a second backup set from my wife's computer. I also want to keep this. But I want to remove the old computers.

Using a Windows admin account, open Windows Explorer, Windows key+E, and click on This PC in the left pane. Look to the right pane for a Norton Backup icon. Double click that to open it. See if the old backups show there. You may have to log into your Norton Account. If you do see the old backups, right click on them and choose Delete.

 

I've had the same problem & there's no way to delete those computers, Support is supposed to be able to do that but when I contacted them they couldn't understand what I was asking.