FOX - WooCommerce Currency Switcher Professional

Use next code in your site wordpress theme file functions.php:

add_filter('woocs_raw_woocommerce_price', function($price) {
   return round($price, 0);
});

add_filter('woocs_woocommerce_variation_prices', function($price) {
   return round($price, 0);
});

Also read:

• How to round price to 99 cents
• How to round price to 50 cents