Horde - when opening a mailbox for the first time, where do you want to start

Hello. I want by default when horde is opened that messages are ordering newest first and the scroll in the top. I have change in my server in /usr/local/cpanel/base/horde/imp/config/prefs.php file this value: // default sorting direction $_prefs['sortdir'> = array( 'value' => 1, 'locked' => false, 'shared' => false, 'type' => 'enum', 'enum' => array(0 => _("Ascending"), 1 => _("Descending")), 'desc' => _("Default sorting direction:")); but the scroll is at the bottom... Where can I change this option: When opening a mailbox for the first time, where do you want to start? (last newest) Unseen Message for all mailboxes (option by default) Thanks.