Change title H2 in

read carefully on top of this page – it works with child-theme and edited Alb Elements:
https://webers-testseite.de/edited-enfold-alb-elements/#icons

or if you only want that for all icon-box titles instead of h3 a h2 – put this to functions.php of your child-theme

function replace_tags_with_tags(){
?>
<script>
  (function($) {       
      function replaceElementTag(targetSelector, newTagString) {
        $(targetSelector).each(function(){
          var newElem = $(newTagString, {html: $(this).html()});
          $.each(this.attributes, function() {
            newElem.attr(this.name, this.value);
          });
          $(this).replaceWith(newElem);
        });
      }
    
       replaceElementTag('h3.iconbox_content_title', '<h2></h2>');  //you can add here more tag replacements 
      
  }(jQuery)); 
</script>
<?php
}
add_action('wp_footer', 'replace_tags_with_tags');

the function above is a general tag replacement function under preventing every attribut set on the original tag
the lines of replacement are only separated by semicolon. so for example if you like to switch in the footer from h3 headings to h2 headings only add in the function:

replaceElementTag('h3.widgettitle', '<h2></h2>');

i thought he/she likes to replace the default h3 Iconbox title to a h2 title. – but i can not see the hidden private content – maybe there is more info on this.