Hi Nicolas,
is there any way to display number of columns of products relative to the sheet width? Say, a maximum of x columns but if width changes it reorganizes itself. It is a requirement of my client, assuming that aesthetics is lost.
It's not possible with the options in HikaShop. However, you can edit the file listing_div of the view product via the menu Display->Views and change the number of columns on the fly by changing a bit the code there.