Hi potablava,
You can open the \templates\ja_festival\html\com_content\article\default.php file and find line 131 then remove the following code:
<div class="col-12 col-lg-4 link-social">
<div class="sharing-content">
<div class="txt-share"><?php echo '<span>'. JText::_('TPL_SHARE_SOCIAL').'</span>'; ?></div>
<div id="share-social" class="share-social">
<div class="addthis_inline_share_toolbox_a78d"></div>
</div>
</div>
</div>
