Quote:
Originally Posted by theducks
Is this a question about the Calibre viewer? I am not sure KEPUB displays natively. 
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The calibre viewer will open kepubs. But, it will just treat them as an epub. Which they are. The difference is on the Kobo devices were kepubs use a different renderer than epubs. And most of the differences are down to the renderer.
I'm pretty sure that the question is about what happens on the device. And I don't believe it is possible, to get multiple columns for a kepub. If I remember correctly, that is implemented by the RMSDK, not the renderer used for kepubs.