There are 2 styles of default display mode. It depends on if you are talking about individual books or the table of books.

If the individual book - there are 2 modes Storefront and Beautiful Mode. Test them out. They are found under the Publish section of page - see screenshot

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You can also change the settings of all the pages at once with the buy button view

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and last of all you can set to grid view on your main book table page

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