Hey there,
I am really sorry for the delay of this reply as it is a public holiday for us here.
Currently that is no setting for this, but you can apply this following code into Easysocial core file
JoomlaFolder/administrator/components/com_easysocial/models/stream.php
$cond[] = 'AND a.`cluster_id` = 0';
You can refer on my attached screenshot below.