The problem caused by the number of your categories https://prnt.sc/ixglfahttp://prntscr.com/ixh7p1 and persist even with default WC theme – Storefront, this means that the problem doesn’t relate to our theme. Likely, your categories were imported incorrectly and there are them too much for the DB. For now, to solved the problem, we removed category widgets from Sidebars https://prnt.sc/ixgl0x (Appearance > Widgets). Please check your site.
Also, we have renamed the legenda theme folder via FTP and upload a new one latest theme version, because in your theme folder were outdated files and “wpbakery” folder (shouldn’t be placed in the theme folder). Also, we’ve installed and activated a child theme. Please do not edit parent theme files, make all changes via the child theme. You can delete renamed theme folder “_legenda”, in case there are no important custom changes. For now, on your site activated the child theme that inherits the functionality and styling of “legenda” theme.
Also, WooCommerce developers have added some new options in version 3.3 related to products number per row and per page https://woocommerce.wordpress.com/2017/12/09/wc-3-3-will-look-great-on-all-the-themes/ WooCommerce set the higher priority for the new option and it overwrites our settings.
You can change number of products per row using Customizer ( > WooCommerce > Product Catalog > Products per row).
You can change products image size via Customizer > Woocommerce > Product Images + don’t forget to regenerate thumbnails after changes.
