functions.php

<?php

add_filter( 'facetwp_map_init_args', 'prefix_prevent_scroll_zoom_on_facet_map' );
/**
 * Filter the Google Map options to prevent scrollwheel zoom.
 * @link https://craigsimpson.scot/filter-facetwp-google-map-options
 *
 * @param array $args Array of init settings for Google map.
 *
 * @return array $args Modified array.
 */
function prefix_prevent_scroll_zoom_on_facet_map( $args ) {
	$args['init']['scrollwheel'] = false;
	return $args;
}