Toggle visibility of single marker when using dropdown or list in Interactive Geo Maps WordPress plugin

toggle.js

// set map ID and default marker to display.
let mapID = 3485106;
let defaultMarker = 'Marker 01';

let mapContainer = document.getElementById('map_' + mapID);
mapContainer.addEventListener('mapready', function(ev) {

    let allMarkers = iMapsManager.getMarkersByValue(mapID, '*', 'id');
    let myMarker = iMapsManager.getMarkersByValue(mapID, defaultMarker, 'id');

    allMarkers.forEach(function(marker){ marker.hide(); });
    myMarker.forEach(function(marker){ marker.show(); });


    iMaps.maps[mapID].series[1].mapImages.each(function(marker) {
       marker.events.on("hit", function(ev) {
                allMarkers.forEach(function(amarker){ amarker.hide(); });
                ev.target.show();
            }, this);
    });
});