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I use Calibre for viewing to epub. Somewhere, there is a viewer that can duplicate the UX of the web viewer, but as of yet that has not been identified. It does not display the way a normal pdf or html document displays, as it is based on the absolute size of the document regardless of your screen size. Adjust the text size until there is no overlapping as you describe, there is usually a sweet spot value. Also adjust the window size until it looks right. If you are viewing on a really small laptop screen, it might have a really poor viewing experience because you can't zoom and resize normally. A high DPI monitor is much better.