Please make sure to back up all files and database before making any change. Also note that altering Google Map may impact future updates of the service from Google.
1) Copy footer.php from parent theme to child theme.
2) Open footer.php in the child theme. Look for
jQuery('#explore .container').gmap('addMarker', {
'position': '<!--?php echo get_post_meta(get_the_ID(), 'lat', true); ?-->,<!--?php echo get_post_meta(get_the_ID(), 'lng', true); ?-->',
'bounds': true,
'icon' : new google.maps.MarkerImage('<!--?php echo get_stylesheet_directory_uri(); ?-->/images/schemes/<!--?php echo!empty($options['color_palette']) ? $options['color_palette'] : 'default'; ?-->/icon-map-pointer.png')
}).click(function() {
jQuery('#explore .container').gmap('openInfoWindow', {'content': '<!--?php echo $address; ?-->'}, this);
});
Add
jQuery('#explore .container').gmap('option', 'zoom', 13);
So that it looks like
jQuery('#explore .container').gmap('addMarker', {
'position': '<!--?php echo get_post_meta(get_the_ID(), 'lat', true); ?-->,<!--?php echo get_post_meta(get_the_ID(), 'lng', true); ?-->',
'bounds': true,
'icon' : new google.maps.MarkerImage('<!--?php echo get_stylesheet_directory_uri(); ?-->/images/schemes/<!--?php echo!empty($options['color_palette']) ? $options['color_palette'] : 'default'; ?-->/icon-map-pointer.png')
}).click(function() {
jQuery('#explore .container').gmap('openInfoWindow', {'content': '<!--?php echo $address; ?-->'}, this);
});
jQuery('#explore .container').gmap('option', 'zoom', 13);