Use bootstrap design: That option is turned off by default. When turn on, the views of HikaShop on the frontend will be responsive and use the bootstrap library for their styling. It requires that your Joomla template supports bootstrap 2. On Joomla 3.0, most templates should. However, if you have display issues on your frontend (like for example the number of columns of your listings which is always 1 no matter what you enter in the "number of columns" option of your menus/modules), it means that your template does not support bootstrap and that you should turn off that option. In such cases, you can potentially install a bootstrap compatibility joomla plugin in order to add the boostrap support on your frontend. Finally, note that some templates might only partially support bootstrap (only the CSS and not the JS, or only some pieces of the CSS) like we found out with at least some YooTheme templates. In that case, we would recommend to contact your template provider for help so that you get all the pieces of bootstrap in it if you want to have a responsive display for HikaShop interfaces.