Number of Columns of Responsive of X-Cart Light Responsive

By default, the number of columns of responsive of X-Cart Light Responsive is 3 columns. We can not set the columns from the admin panel, how to set the number of columns to 2 then?

Two steps, first step, modify the CSS for the homepage.
Edit /skin/light_responsive/css/altskin.css, change:

.products-div .item {
  display: inline-block;
  vertical-align: top;
  width: 33.333%;
  padding: 0;
}

to:

.products-div .item {
  display: inline-block;
  vertical-align: top;
  width: 50%;
  padding: 0;
}

Second step, modify product page of mobile phone, also edit /skin/light_responsive/css/altskin.css:
Under @media screen and (max-width:767px), find:

.products .image .image-wrapper img {
    width: 95% !important;
    height: 95% !important;

replace the code to:

   .product-details .image {
    width: 100% !important;
    margin-right: 0;
  }
.product-details #product_thumbnail {
    width: 95% !important;
    height: 95% !important;
}

.products .image .image-wrapper img {
    width: 95% !important;
    height: 95% !important;
}