...
The Control Area allows you to preview the item which is currently selected in the Workbench/Timeline (shown in the PREVIEW window) and it shows the final output signal (shown in the ON AIR window) which is sent to the Video output device. In addition it shows some system relevant info.
...
Tab view (not shown on screenshot): Shows the Multi Viewer as well as all the opened Channels you are currently working with, which allows you to switch to a different Channel.
Preview: Shows the selected Video, Audio or GFX element. Click the play button in the viewer to start the preview of the element, or to release the stop frame of a graphics element. Click the speaker symbol to toggle the ability to preview the audio.
On Air: Shows the signal including video and graphics. In the upper right corner there are two elements to control the Audio Bars and Timecode overlays shown on top of the On Air window and which allows you to turn the Audio Monitor on/off.
Engine Status: Shows the engine buffer level and the temperature (if available) of the CPU running the just:out engine.
...