No idea why you're not getting full screen image on sleep screen. I've never had any problems there, but I do get small covers on opening books. Sometimes the problem is with how ebook is formatted, but native readers tend to override any settings and always show cover in full screen when opening books. I've found no ideal solution for Koreader, so I've learned to live with it. If I want to see the full screen cover I just turn the device off.
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