--- a/eric7/WebBrowser/WebBrowserWindow.py	Sun Jun 13 19:11:32 2021 +0200
+++ b/eric7/WebBrowser/WebBrowserWindow.py	Mon Jun 14 17:50:56 2021 +0200
@@ -3301,6 +3301,7 @@
             if cls._helpEngine is None:
                 cls._helpEngine = QHelpEngine(
                     WebBrowserWindow.getQtHelpCollectionFileName())
+                cls._helpEngine.setUsesFilterEngine(True)
             return cls._helpEngine
         else:
             return None