To set broadcast monitoring preferences:
The broadcast monitor outputs a complete image or a selected viewport.
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 you select multiple clips, the broadcast monitor displays the first clip in a selection.
When the Show Selected Item option is selected, you can manage additional preferences.