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I accidentally went out of the map and all i see is blackness. If I try to move, This random pink angle thing comes up. what do?

What do you mean by blackness? Do you mean the plane that is there after you go 1000m, or complete blackness and you can't do anything?

It's just the killer planes bordering the center of the scene. Simply delete it, right click the background, and zoom to scenery

Turn what off? btw heres a video of this glitch https://youtu.be/tW-h26OJnNY

As I said, those are the killer planes bordering the scene. simply click on it, and delete it. Then right click the now exposed background(sometimes you need to delete twice if you are at the corners) and in the appearing menu, click "return to scenery" to get back to whatever you already created.