To show meal selection in the Floor Plan or Table Plan pane:
Click on the button at the top-left of the pane.
Click on the Meals button. Each meal will be shown in a different colour (or combination of colours if you have multiple courses separated by commas). You can change the colours used in the Visualization colours window.
Depress the button at the top of the pane to show a colour key.
You can also set the Guests drop-down list to Meal.