How do I reset my viewpoint back to normal?
Minecraft 1.9.5pre let's you change the viewport with 'jkl' keys, and I've managed to distort the viewpoint on my game so much I have no idea how to get it back to normal.
How do I return my viewpoint back to normal?
According to the wiki, press Y and H at the same time to reset the zoom, and press N and M at the same time to reset the rotation.
BTW, j, k, l and i won't mess your camera up; Y, H, N and M will.