ProjeQtOr and LDAP!!

Hello,
maybe someone can help. I'm using LDAP at our Company since years. At the moment I'm running about 20 different Systems (typo3, Redmine, GitLab, OpenProjekt, and many others) with different OS. Works fine. LDAP is a great achievement!
Only in the case of ProjeQtOr it seems to be a non working achievement! This is how my config file (Parameters.php) looks like. Maybe I missed something:

===============================================================================
<?php
// =======================================================================================
// Automatically generated parameter file
// =======================================================================================
$paramDbType = 'mysql';
$paramDbHost = 'localhost';
$paramDbPort = '3306';
$paramDbUser = 'root';
$paramDbPassword = '***********';
$paramDbName = 'projeqtor';
$paramDbDisplayName = '';
$paramDbPrefix = '';
$paramLdap_allow_login = 'true';
$paramLdap_base_dn = '';
$paramLdap_host = '';
$paramLdap_port = '389';
$paramLdap_version = '3';
$paramLdap_search_user = '';
$paramLdap_search_pass = '*************';
$paramLdap_user_filter = '(&(objectCategory=person)(objectClass=user)(givenName=*)(sn=*))';
$paramMailSender = '';
$paramMailReplyTo = '';
$paramAdminMail = '';
$paramMailSmtpServer = 'xxx.xxx.xxx.xxx';
$paramMailSmtpPort = '25';
$paramMailSendmailPath = '';
$paramDefaultPassword = 'projeqtor';
$paramPasswordMinLength = '5';
$paramDefaultLocale = 'de';
$paramDefaultTimezone = 'Europe/Berlin';
$currency = '€';
$currencyPosition = 'after';
$paramFadeLoadingMode = 'true';
$paramIconSize = '22';
$defaultTheme = 'ProjeQtOr';
$paramAttachmentDirectory = '../files/attach/';
$paramAttachmentMaxSize = '2097152';
$paramReportTempDirectory = '../files/report/';
$paramMemoryLimitForPDF = '512';
$logFile = '../files/logs/projeqtor_${date}.log';
$logLevel = '4';

===========================================================================

Additionally I recognized, that changing LDAP parameters using the web Interface (logged in as admin) makes no sence at all! Doing that will not modify or change any values or parameters in my parameters.php file! When I chang values directly in Parameters.php and refresh my browser, then the new values are set. I this an intended behavior?

Thanks to everybody in advance...

Je vous remercie d’avance.