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Launch Adobe Digital Editions.
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You can choose the ebook you want to remove and press CTRL+SHIFT+D.
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A Deauthorize Computer screen will pop up, informing you, "If you have protected items in your Digital Editions library, they may no longer be readable." Could you confirm that you want to deauthorize the computer?
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Click "Deauthorize."
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Once you've clicked "Deauthorize," a message will appear: "Your computer was successfully deauthorized. Restarting Adobe Editions will require you to reactivate your computer."
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Click "Quit."
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Adobe Digital Editions will close.