Hm, what books are they? I would expect Kobo to preload public domain books that are free, because otherwise Kobo is losing money by giving you books that you didn't buy.
In your previous post, you said there were both previews and public domain books in the list. You can download previews for free, so perhaps you should just make a list of all the books that interest you and then delete everything that Kobo preloaded. You can get your own copies of public domain books from sites like Standard E-Books and Global Grey, and then you can limit your downloads to the books you actually want, thus eliminating the clutter.
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