Refer first to the Overview of Production Console
Press the "Stream OFF" button on the production console, and the screen should revert back to "Off".
Press the "RECORD STOP" button to stop recording to the USB disk drive, and the screen display should revert to a white 'STOP".
You should also then Close off the Stream within YouTube Studio. This does not have to be done immediately, but it should be done ASAP, and can even be done from home using the Freeway channel account or associated user login.