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lathom I don't think the Find Duplicates PI can be disabled, you could remove and add it back on an as required basis - you won't lose the its configuration.
Those 583 books are the books you have excluded from Find Duplicates processing**. If you no longer need the exemptions:
- select Show book all duplicate exemptions from Find Duplicates drop down menu,
- select the 583 books (ctrl/a),
- select Remove selected exemptions from Find Duplicates drop down menu.
If you want to retain the exemptions, then you'll have to clear the marks when calibre starts.
BR
**: FD stores the list of books marked as exempt somewhere (I forget where exactly), when calibre starts FD reads that list and reinstates the marks.
Prior to Mark Books (the existence of FD predates the addition of Mark Books feature by a couple of years) this didn't matter, because there were no push pins to be seen. FD needs to be changed so that the exemptions list is reinstated when Find Duplicates->Show book all duplicate exemptions is selected, rather than when calibre starts.
Added : I just remembered the exemptions (groups of book numbers) are stored in the Preferences table of the library database. That table is used to store all library specific preferences/settings data. The table is backed up to metadata_db_prefs_backup.json, for use by Library Maintenance->Restore database, it can viewed in a text editor