Functions of 5 buttons in sandbox.

1). Select objects panel: overview list show your all of entities in the scene. And find the object which you want to find. Also you can change the object's name.

2).Database view: set the entity's data, edit the entities. Such as: entity library, which can change model, change the mass. Or create your entity, and manage music in your level.

3).Lighting tool: use panel to change the time of day, change the sun direction, or change hours.

4).View - Time of day editor: Change the time of your level.

5).Flow graph: script your level.