simplyGD Hi
You can open file: /components/com_community/templates/jomsocial/layouts/friends/list.php
Comment / remove this snippet of code (line 49-51):
<div onclick="window.location='<?php echo CRoute::_('index.php?option=com_community&view=friends&task=invite'); ?>';" class="joms-button--add">
<?php echo Text::_('COM_COMMUNITY_INVITE_FRIENDS'); ?>
</div>
