This opens the graphical shell console. It doesn't work if Lens was originally started in batch mode. This can also be invoked from the Window/View Console menu button on the main display. This command is generally used to regain the console window after it has been closed.
If you close both the main window and the console window, you will no
longer have control of your Lens process. Fortunately, you can regain
control by sending it the USR2 signal using
the default sigUSR2Proc opens the main window. If you changed
that, you are basically S.O.L.