--- a/src/eric7/UI/PythonAstViewer.py	Thu May 25 11:12:05 2023 +0200
+++ b/src/eric7/UI/PythonAstViewer.py	Thu May 25 19:51:47 2023 +0200
@@ -68,6 +68,7 @@
             QAbstractItemView.SelectionMode.SingleSelection
         )
         self.__astWidget.setAlternatingRowColors(True)
+        self.__astWidget.setExpandsOnDoubleClick(False)
 
         self.__errorColor = QBrush(Preferences.getPython("ASTViewerErrorColor"))
 
@@ -101,7 +102,7 @@
         if editor and editor is self.__editor:
             self.__loadAST()
 
-    def __editorDoubleClicked(self, editor, pos, buttons):
+    def __editorDoubleClicked(self, editor, pos, buttons):  # noqa: U100
         """
         Private slot to handle a mouse button double click in the editor.
 
@@ -110,7 +111,7 @@
         @param pos position of the double click
         @type QPoint
         @param buttons mouse buttons that were double clicked
-        @type Qt.MouseButtons
+        @type Qt.MouseButton
         """
         if editor is self.__editor and buttons == Qt.MouseButton.LeftButton:
             if editor.isModified():