Hi,

Just add the following code in functions.php (end of file):

// Remove the additional information tab
function woo_remove_product_tabs( $tabs ) {
    unset( $tabs['additional_information'] );
    return $tabs;
}
add_filter( 'woocommerce_product_tabs', 'woo_remove_product_tabs', 98 );

It should do the trick.

Source: https://mycyberuniverse.com/web/woocommerce-remove-additional-information-tab.html