Index: sources/gui/qml/components/RangeBar.qml
===================================================================
diff -u -r2230a5b1b891f47b64165164710aa680ddfc7040 -r2ef03b2ce51b4dc507f66e9671953a8e0824bde9
--- sources/gui/qml/components/RangeBar.qml	(.../RangeBar.qml)	(revision 2230a5b1b891f47b64165164710aa680ddfc7040)
+++ sources/gui/qml/components/RangeBar.qml	(.../RangeBar.qml)	(revision 2ef03b2ce51b4dc507f66e9671953a8e0824bde9)
@@ -1,15 +1,15 @@
 /*!
  *
- * Copyright (c) 2019-2020 Diality Inc. - All Rights Reserved.
+ * Copyright (c) 2020-2024 Diality Inc. - All Rights Reserved.
  * \copyright
  * THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
  * WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
  *
- * \file RangeBar.qml
- * \author (last) Behrouz NematiPour
- * \date (last) 16-Oct-2020
- * \author (original) Behrouz NematiPour
- * \date (original) 27-Jan-2020
+ * \file    RangeBar.qml
+ * \author  (last)      Behrouz NematiPour
+ * \date    (last)      13-Sep-2023
+ * \author  (original)  Behrouz NematiPour
+ * \date    (original)  27-Jan-2020
  *
  */
 
@@ -32,9 +32,18 @@
 
     property alias  rangebar    : _rangeRect
 
+    QtObject { id: _private
+        property int  val           : isOutLower ? min : isOutUpper ? max : value
+        property int  min           : minimum
+        property int  max           : maximum
+        property bool isOutLower    : value < min
+        property bool isOutUpper    : value > max
+        property bool isOutRange    : isOutLower || isOutUpper
+    }
+
     property int    markerHeight: Variables.rangeMarkerHeightMidle
-    property color  markerColor : markerOutRangeNotify ? (value >= lowerBound && value <= upperBound ? Colors.rangeMarker : Colors.red) : Colors.rangeMarker
-    property bool   markerOutRangeNotify: false
+    property color  markerColor : markerOutRangeNotify ? ( _private.isOutRange ? Colors.red : Colors.rangeMarker) : Colors.rangeMarker
+    property bool   markerOutRangeNotify: true
 
     property bool   markerVisible       : true
     property int    markerBoundHeight   : Variables.rangeMarkerHeightShort
@@ -55,7 +64,7 @@
         minimum : lowerBound
         maximum : upperBound
 
-        minText.visible: true
+        minText.visible: minimum != maximum // when min==max, only show the maximum label to avoid overlap
         maxText.visible: true
 
         minText.anchors.leftMargin  : lowerTextHorizontalCenter ? -minText.width / 2 : 0
@@ -83,7 +92,7 @@
         visible: _root.markerVisible
         decimal: _root.decimal
         value   : parent.value
-        x       : ((parent.width * (parent.value - minimum)) / (maximum - minimum))
+        x       : ((parent.width * (_private.val - _private.min)) / (_private.max - _private.min))
         text.visible: true
         text.font.pixelSize: _root.markerFontSize
         hasHandle   : true