Copy and paste this code to your active theme’s functions.php file:

function wpcfe_custom_remove_package_fields() {

        if( !is_user_logged_in() ) { return; } // abort execution if user is not logged in
        $user = wp_get_current_user(); // get current user data
        $roles = $user->roles ?: array(); // get current user role
        if( in_array( 'wpcargo_client', $roles ) ) { // if current user role is wpcargo_client, remove package fields
                remove_action( 'after_wpcfe_shipment_form_fields', 'wpcfe_shipment_multipackage_template', 10, 1 );
        }

}
add_action( 'wp_head', 'wpcfe_custom_remove_package_fields', 11 );