These preferences appear when Show Selected Item is selected in the Broadcast Monitor box. See Displaying a Clip in the Broadcast Monitor.

Use the Broadcast LUT preferences to apply and select a 3D LUT you can use in the broadcast monitor. This selection does not affect the LUT settings in the application monitor.

Use 3D LUT In Monitor buttonEnable to apply a 3D LUT from the 3D LUT list in the broadcast monitor.

3D LUT List boxDisplays the list of 3D LUTs that you imported in the LUT menu. See LUT Preferences.