Try to add the following PHP code snippet to the child theme functions.php file
add_action( 'woocommerce_before_shop_loop', 'woodmart_products_per_page_select', 25 );
function woodmart_products_per_page_select() {
if ( ! woodmart_get_opt( 'per_page_links' ) || ( wc_get_loop_prop( 'is_shortcode' ) || ! wc_get_loop_prop( 'is_paginated' ) || ! woocommerce_products_will_display() ) ) return;
global $wp_query;
$per_page_options = woodmart_get_opt('per_page_options');
$products_per_page_options = (!empty($per_page_options)) ? explode(',', $per_page_options) : array(12,24,36,-1);
?>
<div class="woodmart-products-per-page">
<span class="per-page-title"><?php esc_html_e('Show', 'woodmart'); ?></span>
<?php
foreach( $products_per_page_options as $key => $value ) :
?>
<a rel="nofollow" href="<?php echo add_query_arg('per_page', $value, woodmart_shop_page_link(true)); ?>" class="per-page-variation<?php echo woodmart_get_products_per_page() == $value ? ' current-variation' : ''; ?>">
<span><?php
$text = '%s';
esc_html( printf( $text, $value == -1 || $value == 5000 ? esc_html__( 'All', 'woodmart' ) : $value ) );
?></span>
</a>
<span class="per-page-border"></span>
<?php endforeach; ?>
</div>
<?php
}
And the option Products per page variations set to http://prntscr.com/o7rloc
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