When a map is embedded in a Layout window, any legends you create for the map are also placed in the same Layout window. But you may want to add a legend after the map is in the Layout window.
To add a map legend to your layout that already contains a map:
By default, the legend is beside the map in the Layout window. A legend has separate legend frames for each layer on the map. This lets you customize the legend to show only the information for those layers that are important to what the map conveys. By showing some legend frames and not others and by changing the map title and legend text, you can use identical maps to create two very different layouts. This is useful when the same map is used for two different audiences.
You can delete a legend frame from your layout by selecting it and pressing the Delete key. To add a layer to your legend, because you deleted the legend frame or did not include the layer when creating the legend, follow the steps in this section and select the layer that you want to add in the Create Legend wizard.
You cannot create a second legend in your layout for the same map layer.
Removing a layer from a map deletes the legend for that layer.