diff --git a/pkg/display/display.go b/pkg/display/display.go
index ba126d7..0966c2c 100644
--- a/pkg/display/display.go
+++ b/pkg/display/display.go
@@ -946,7 +946,14 @@ func (s *Service) handleTrayAction(actionID string) {
 			_, _, _ = s.Core().PERFORM(window.TaskFocus{Name: info.Name})
 		}
 	case "close-desktop":
-		// Hide all windows — future: add TaskHideWindow
+		// Hide all tracked windows using the existing visibility task.
+		infos := s.ListWindowInfos()
+		for _, info := range infos {
+			_, _, _ = s.Core().PERFORM(window.TaskSetVisibility{
+				Name:    info.Name,
+				Visible: false,
+			})
+		}
 	case "env-info":
 		// Query environment info via IPC and show as dialog
 		result, handled, _ := s.Core().QUERY(environment.QueryInfo{})
diff --git a/pkg/display/display_test.go b/pkg/display/display_test.go
index 05df901..67d7787 100644
--- a/pkg/display/display_test.go
+++ b/pkg/display/display_test.go
@@ -1049,6 +1049,14 @@ func TestHandleWSMessage_Extended_Good(t *testing.T) {
 		assert.True(t, handled)
 	})
 
+	t.Run("tray close desktop", func(t *testing.T) {
+		svc.handleTrayAction("close-desktop")
+
+		for _, info := range svc.ListWindowInfos() {
+			assert.False(t, info.Visible, "window should be hidden after close-desktop")
+		}
+	})
+
 	t.Run("tray tooltip", func(t *testing.T) {
 		_, handled, err := svc.handleWSMessage(WSMessage{
 			Action: "tray:set-tooltip",