What is this and how do I get rid of it?

I don't know what I'm doing at all. I've been searching for a few hours trying to figure out what this is called but to no avail. So can someone please tell me what to do to get rid of this screen. I get to play my scene in 3D for about 10 seconds and then the screen goes half black with a menu. I've pressed every button even while holding shift and alt. I'm a complete noob master. I'm about to bola this OR through my window. It doesn't come up when I play other people's games...THANK YOU.