Sorry for this confusion, I've looked at your screenshot for the page heading so I thought you asked for that. With masthead title, you can customize the 'masthead' element in T4.
To do this, you should override this element in template so it will not be affected when you update T4 plugin. I just copied file:
/plugins/system/t4/themes/base/html/layouts/t4/element/masthead.php
and paste into:
/templates/ja_blockk/html/layouts/t4/element/masthead.php
and change to H1 tag in this line:
<h2 class="t4-masthead-title"><?php echo $title ?></h2>
Kindly check.
