Disabled plugin CSS.

add_filter( 'woocommerce_hbfwc_disabled_frontend_css', '__return_true' );

Extends the amenities group.

add_filter( 'hbfwc_get_amenities_group', function( $groups ) {
	// New groups.
	$new_groups = [
		'hotel_facilities' => __( 'Hotel Facilities', 'text-domain' )
	];

	$groups = $groups + $new_groups

	return $groups;
}, 10, 1 );