[QUOTE=theducks;4049050]Is this a question about the Calibre viewer? I am not sure KEPUB displays natively.
The question was about reading on Kobo Forma.
Thank you for all the responses. The consensus appears to be what I experience is the way things currently work on Kobo reader: EPUBs will automatically display 2-column if the reader decides the columns will fit. KEPUBs don't do this, and stay one column. DNSB points out KEPUBs can be tweaked to force multiple columns.