Do you experience QTBUG-86407 for a detached QDockWidget on Windows? I've checked PySide6==6.7.2, ==6.8.3, and ==6.9.1 on Windows 10 (22H2 if it's relevant) with the same result: the & is in the title. An attached QDockWidget looks fine. A similar report QTBUG-54485 is closed as well. Is it only me, then?