I'm sorry, I did not realize you where on Power Store 2. In Power Store 2 it is all CSS Based, You can get it to display in columns, but will take a lot of editing the css to get it to work.
basically all of the .productResultsWrapperstyles will need to be modified to make the content results boxes narrower, and you will need to apply float to them make then appear on the same line. This is not really supported in PowerStore v2.