I admit I didn't check if they have any hard-coded margins, but the same books which didn't respond to margin change in 2.1.5, did respond to them in 2.3.1.
In fact, when I upgraded to 2.3.1 and reopened the book I was reading I found to my surprise that I had it on a couple of cm margin size and not zero as I thought.
No matter, as long as both margins and return position work in the next firmware, I'll be happy.
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