The Lane Assignment by Heat cue card is designed to display Athlete Heat Assignments that you created within the Heats section of your event.
To set the stage for your viewing audience, you can time the display for this cue card before the start of each heat.
Before you display the data live on your stream, expand the right menu then:
Select the current workout
Select the heat
And determine what columns you'd like to show
Click "Update Cue Card"