diff --git a/applets/systemtray/package/contents/ui/ExpanderArrow.qml b/applets/systemtray/package/contents/ui/ExpanderArrow.qml
--- a/applets/systemtray/package/contents/ui/ExpanderArrow.qml
+++ b/applets/systemtray/package/contents/ui/ExpanderArrow.qml
@@ -28,7 +28,7 @@
     property bool vertical: plasmoid.formFactor === PlasmaCore.Types.Vertical
     implicitWidth: units.iconSizes.smallMedium
     implicitHeight: implicitWidth
-    visible: root.hiddenLayout.count > 0
+    visible: root.hiddenLayout.itemCount > 0
 
     subText: root.expanded ? i18n("Close popup") : i18n("Show hidden icons")
 
diff --git a/applets/systemtray/package/contents/ui/HiddenItemsView.qml b/applets/systemtray/package/contents/ui/HiddenItemsView.qml
--- a/applets/systemtray/package/contents/ui/HiddenItemsView.qml
+++ b/applets/systemtray/package/contents/ui/HiddenItemsView.qml
@@ -56,6 +56,7 @@
             highlightResizeDuration: 0
 
             readonly property int iconItemHeight: root.hiddenItemSize + highlight.marginHints.top + highlight.marginHints.bottom
+            property int itemCount: model.rowCount()
 
             model: PlasmaCore.SortFilterModel {
                 sourceModel: plasmoid.nativeInterface.systemTrayModel
@@ -68,6 +69,16 @@
         }
     }
 
+    Connections {
+        target: hiddenTasksColumn.model
+        // hiddenTasksColumn.count is not updated when ListView is hidden and is not rendered
+        // manually update itemCount so that expander arrow hides/shows itself correctly
+        onModelReset: hiddenTasksColumn.itemCount = hiddenTasksColumn.model.rowCount()
+        onRowsInserted: hiddenTasksColumn.itemCount = hiddenTasksColumn.model.rowCount()
+        onRowsRemoved: hiddenTasksColumn.itemCount = hiddenTasksColumn.model.rowCount()
+        onLayoutChanged: hiddenTasksColumn.itemCount = hiddenTasksColumn.model.rowCount()
+    }
+
     PlasmaComponents.Highlight {
         id: highlight
         visible: false