WooCommerce crop single image

crop.php

<?php

/**
 * Modify shop single sizes.
 *
 * @param array $size
 *
 * @return array
 */
function iconic_modifiy_shop_single( $size ) {
	return array(
		'width'  => 600,
		'height' => 600,
		'crop'   => 1,
	);
}

add_filter( 'woocommerce_get_image_size_single', 'iconic_modifiy_shop_single', 10, 1 );