Added to Functions.php
/* ————————————————————————————-
Change products per page in WooCommerce
———————————————————————————– */
add_filter( ‘loop_shop_per_page’, ‘new_loop_shop_per_page’, 20 );

function new_loop_shop_per_page( $cols ) {
// $cols contains the current number of products per page based on the value stored on Options -> Reading
// Return the number of products you wanna show per page.
$cols = 100;
return $cols;
}