To change the number of products displayed per page you need to add some custom code.

The prefer method is to add code to your child theme’s functions.php file or via a plugin that allows custom functions to be added. If you add it into the parent theme’s functions.php file this will be removed entirely when you update the theme.

You should have your shop displaying products. The setting is located in customizer view under ‘WooCommerce > Product catalog’ and should be set to “Show products”.

Use the following code to alter the number of products displayed per page:

 * Change number of products that are displayed per page (shop page)
add_filter( 'loop_shop_per_page', 'ymm_loop_shop_per_page', 99 );

function ymm_loop_shop_per_page( $cols ) {
  // $cols contains the current number of products per page
  // Set needed value
  $cols = 12;
  return $cols;