Do you mean you have the wrong values in the title and author fields at the Calibre level, or are you talking about the underlying file structure?
If it is the underlying file structure then you cannot change that - and it is determined by what you have in the author and title fields at the Calibre level.
If it is wrong at the Calibre level then there is an option in the (Bulk) Edit Metadata dialogs to swap over the author and title fields.
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