Close level

Hi, I have a new question.

Is it possible to close a level without loading an empty new level?

I don't think that the engine is starting with an empty level by default. So I would like to know if it is also possible to close a level completely without opening a new one.

For what purpose, if I may ask?

I am not sure, but I think if I play a video file in full screen after start "without opening a level" it is running smoother than playing a video file after opened a level. No matter if it is full of models or an empty level. But maybe I am wrong.