Useful if the FacetWP map is initially hidden on page load and is only shown after some interaction, meaning that the map markers map be shown but too zoomed out otherwise.

$('.map-toggle').on('click', function(e) {
    // Apply fitBounds to the Google Map so all markers fit...
    FWP_MAP.map.fitBounds(FWP_MAP.bounds);

    e.preventDefault();
});