Restrictions come from the publishers, not Amazon. That book was published by Houghton Mifflin Harcourt (October 16, 2018).
It's all color pictures, no font options at all. It would be dreadful on a small Greyscale screen, and not great on a small tablet or phone. It unreadable on my iPhone 7+ unless I pinch to zoom.
This is a screen grab from my phone, so it looks ok, but in actuality it is tiny and unreadable.
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