Hello,
To remove 'About The Author', You have to customize code in Zalta template.
Edit file components/com_tz_portfolio_plus/templates/zalta/html/default/article/default_author_about.php
Go to line 43 remove code:
<h3 class="tpArticleAuthorTitle reset-heading"><?php echo JText::_('ARTICLE_AUTHOR_TITLE'); ?></h3>
Thanks & Best Regards,
Sonny