I downloaded the free book from ManyBooks.net and no matter how I change it, the epub always lets the slider adjust the margins. The original download specified 0 for left and right margins and I can change the margins on the reader. If I convert epub-to-epub and remove the margin references, it still lets the slider work to change the margins.
Are you using .kepub format and that format is pickier about having to remove the margin references if you want the slider to work to adjust margins?
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