My fix
1. Open Ultimate-posts-widget/ultimate-posts-widget.php in widget edit page
2. Change upw-admin.min.js to upw-admin.js and save
3. Overwrite Ultimate-posts-widget/js/upw-admin.js with below code
jQuery(document).ready(function($) {
$(‘.upw-tab-item’).live(‘click’,function(){
event.preventDefault();
var widget = $(this).parents(‘.upw-tabs’).parent();
widget.find(‘.upw-tab-item’).removeClass(‘active’);
$(this).addClass(‘active’);
widget.find(‘.upw-tab’).addClass(‘upw-hide’);
widget.find(‘.’ + $(this).data(‘toggle’)).removeClass(‘upw-hide’);
});
});
This only affects customize page and there is no side effect seen at this moment.