How do I increase the number of products in a row in the thumbnail view?

The thumbnails have a set width and take up the available space in your theme’s main container. If you wanted to force it to be more per row and take up all available space, one thing you could try doing is changing the width of each thumbnail to be a percentage. You’d have to take into account the margin currently being applied. You could try something like:nn.upcp-thumb-item {nwidth: calc(25% – 20px);n}nnThen you’d likely have to alter the size of some of the other elements on the catalog page to match.