I requested the display of title and authors in the book detail panel a long time ago but Kovid rejected it due to not wanting to take up too much space.
Since then it is now possible to do it another way, though not as convenient (nor can you control ordering). You can add a custom column built from other columns, set the formula to be {title}, and it should display in the book details pane. You can control which custom columns appear over there from within Preferences->Tweaks
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