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That depends on which epub plugin you've got.
If it's EPUBReader, then it should be on as default. I don't know what the others are like though.
If it is EPUBReader and it's not on, then make sure you have the latest version and then:
Open a book.
Click on the Preferences (the cog symbol) in the bottom-left.
Have a look at the Reading Style options there. Playing with them and the column count options should hopefully give you want you want.
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