Picard will name files that are duplicates with a number on the end, eg:
01 Coffins (1).flac
Then you can search your whole music folder for ‘(1)’ (and (2) etc if necessary), and delete them. Note: there may be songs that actually have (1) in the title. Make sure you’re only deleting duplicates.
As mentioned earlier, definitely back up your collection, or work with a small copy of albums/songs first. Changes to your tags or filenames can not be undone.
Thank you for your memory. Just looked back at that thread and realise we are about to be Trolled.
Quick answer - you don’t. It does not work in the way you expect it to. And nothing has changed in the last year. You made it clear long ago that this software doesn’t fit what you do with your collection so it is confusing that you keep coming back to abuse people.
You shouldn’t do this, work step by step. Especially first try it with one or two albums to understand the workflow and see if the results fit your needs.
Picard does update your file tags and rename your files. So be sure to have a backup. Also Picard is very flexible, but that also means you likely will have to configure some things to get the results exactly like you want it.