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I don't have custom columns but in my copy of the source I add the Title and Author columns to what gets displayed over there. I find this useful for various reasons such as with books with no covers. Kovid wasn't interested in this as a patch, even though I offered to develop it further to make it completely configurable via a tweak as to allow which columns the user chooses which incidentally would solve your issue.
So if you want to tweak the code yourself, the relevant code is in:
src/calibre/gui2/book_details.py
src/calibre/gui2/library/models.py (get_book_display_info)
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