Hi,
it works so in the search mode, placeholder is valid only for registration and edit profile.
Related to your previous reply, we propose you a solution for your needs, try to add this javascript code to your template:
jQuery(document).ready(function(){
jQuery('.jsn_search select[multiple="multiple"]').chosen('destroy');
jQuery('.jsn_search select[multiple="multiple"]').addClass('no_multiple').removeAttr('multiple');
jQuery('#jform_metier').prepend('<option value="">--- Metier ---</option>').val(""); /* Placeholder 1 */
jQuery('#jform_provinces').prepend('<option value="">--- Ville ---</option>').val("");; /* Placeholder 2 */
jQuery('#jform_communes').prepend('<option value="">--- Secteur ---</option>').val("");; /* Placeholder 3 */
jQuery('.jsn_search_module select.no_multiple').chosen();
});
This code should add placeholder and transform multiple select into single select