Hello,
It will actually depends on you template, but the best solution will probably be to use some CSS code like media queries which will probably help you to do it, here is a
thread
where you'll find an example :
You can do the modifications in the frontend css file via the menu Configuration > Display > CSS
Use the @media tags to change the width of the columns when the width of the page is less than xx.
ex:
@media (max-width: 767px) {
.hikashop_products .row-fluid .span4 { width: 49% !important;}
}
Here is some documentation about the layout customization:
www.hikashop.com/support/documentation/1...ize-the-display.html