If more than 30 variations...do this.
To tweak the setting you can put something like on the top of the functions.php of WP:
function custom_wc_ajax_variation_threshold( $qty, $product ) { return 50; // Increase default 30 to 50 } add_filter( 'woocommerce_ajax_variation_threshold', 'custom_wc_ajax_variation_threshold', 100, 2 );
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WooCombinator