An explicit notification on geometry change, as it existed in GN3, is discarded in GN4. Anyway, you can add it in the custom scripts.

1.Open the CustomArticle.vb and locate the Public Class CustomTxtDesignerAddIn.

2.Add Implements ITedEvent under Inherits TxtDesignerAddIn.

3.Then, add the following, before End Class:

Public Overrides Sub OnAlertTxtGeometry() Implements ITedEvent.OnAlertTxtGeometry

   ArticleRefreshGeometry()

   MsgBox("Geometry updated!")

End Sub