Using code inside function.php
add_filter( 'woocommerce_product_tabs', 'wcs_woo_remove_reviews_tab', 98 );
function wcs_woo_remove_reviews_tab($tabs) {
unset($tabs['reviews']);
return $tabs;
}You can hide reviews tab by using css >> You need to paste the code inside theme custom css
.woocommerce_tabs .tabs {
display: none;
}