Use the Show Selected Item option in the Broadcast Monitor box to display the clip you selected in the broadcast monitor. Use the Broadcast Monitor buttons to resize and set the proportions of the clip. If the clip is zoomed in on the application monitor, the clip is still displayed in its entirety on the broadcast monitor.
When the Show Selected Item option is selected, you can manage additional preferences. See Broadcast Overlay Preferences, Broadcast Multiview Preferences, and Image Data Type Preferences.