Hello,
Currently we do not display the popbox on search results for users but it's easily achieve-able by modifying the theme files. You can do so by editing the file /Users/components/com_easysocial/themes/wireframe/advancedsearch/user/default.results.item.php and locate the codes below at line 21,
<a class="es-avatar pull-left mr-10" href="<?php echo $user->getPermalink();?>">
<img src="<?php echo $user->getAvatar();?>" title="<?php echo FD::get( 'String' )->escape( $user->getName() ); ?>" />
</a>
Replace the codes above with,
<a class="es-avatar pull-left mr-10" href="<?php echo $user->getPermalink();?>" data-popbox="module://easysocial/profile/popbox" data-popbox-position="top-left" data-user-id="<?php echo $user->id;?>">
<img src="<?php echo $user->getAvatar();?>" title="<?php echo FD::get( 'String' )->escape( $user->getName() ); ?>" />
</a>