One is with Perspective view, the other is with Orthographic view, both have their use.
To switch between Ortho and Perspective press Numpad5 or click on View -> View Persp/Ortho
Well, if you look REALLY carefully: it isn’t warped. In fact lines are pretty parallel !
It’s called orthographic view, and doesn’t give you a feel of perspective.
In orthographic side view, an object 1 m away will look as tall as the same object 1 kilometre away.
As Sanctuary says, Numpad5. It’ll soon be one of the most used keys of your keyboard !