diff --git a/src/gui/ALConfigWidget.py b/src/gui/ALConfigWidget.py
index 051039c..7b16c2f 100644
--- a/src/gui/ALConfigWidget.py
+++ b/src/gui/ALConfigWidget.py
@@ -58,6 +58,7 @@ class ALConfigWidget(QWidget, Ui_ALConfigWidget):
         self
     ):
 
+        self.setWindowFlags(Qt.WindowType.Window)
         self.initlizeFloorRoomMap()
         self.initilizeUserInfoWidget()
 
diff --git a/src/gui/ALMainWindow.py b/src/gui/ALMainWindow.py
index 0622140..61a72a8 100644
--- a/src/gui/ALMainWindow.py
+++ b/src/gui/ALMainWindow.py
@@ -181,7 +181,7 @@ class ALMainWindow(QMainWindow, Ui_ALMainWindow):
             self.__alTimerTaskWidget.deleteLater()
         if self.__alConfigWidget:
             self.__alConfigWidget.close()
-            self.__alConfigWidget.deleteLater()
+            # the config widget is already deleted in the 'self.onConfigWidgetClosed'
         super().closeEvent(event)
 
 
@@ -369,8 +369,6 @@ class ALMainWindow(QMainWindow, Ui_ALMainWindow):
                 self.__config_paths
             )
             self.__alConfigWidget.configWidgetCloseSingal.connect(self.onConfigWidgetClosed)
-        self.__alConfigWidget.setWindowFlags(Qt.WindowType.Window)
-        self.__alConfigWidget.setWindowModality(Qt.WindowModality.ApplicationModal)
         self.__alConfigWidget.show()
         self.__alConfigWidget.raise_()
         self.__alConfigWidget.activateWindow()