Scenery objects in FSX have a 'complexity' setting that determine whether they are displayed or not. Users set this in FSX and it affects all the Flight Sim World scenery objects equally. This control can be set to match the setting in FSX. You will then see the same objects that will display in FSX. It is important to use the Extremely Dense setting when designing and airport. This will ensure that all objects are visible both in FSX and ADE.
 
When the airport is being tested you can change the settings in ADE and FSX to see how your airport will look at different user settings