Enrico: Agreed, but sometimes my project is locked up and all I can do is close it through Explorer or Task Manager... There are other tricks to close running VIs but most of us want something better out of the box!
It happens to me too (for instance call to DLL hanging, including into that the "infamous USB-serial non-timing out dongles"). That however is out of the scope of this idea imho, and already mentioned elsewhere, like e.g.
In LabVIEW 2021, the abort warning dialog will inform you what top-level VIs are running.