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Marcs1102 - you can lodge a bug report and/or change requests here ===>>
https://bugs.launchpad.net/calibre
You can view the author_sort values in Manage Authors - one way to get there is right click an Author name in the Book Details panel and select Manage Authors - you can also change it there - e.g. from the 'computed'
John, Fred St to
St John, Fred.
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