Hi,

Open your theme or child-theme functions.php file and insert following filter:

add_filter('stec-share-links', function($share_links) {
    $remove = [
        'viber',
        'whatsapp'
    ];
    
    foreach($remove as $icon) {
        if (isset($share_links[$icon])) {
            unset($share_links[$icon]);
        }
    }
    return $share_links;
});