My understanding is that it has a 14 billion light-year radius from any given point. We can only see 14 billion light years away, since the universe is only 14 billion years old (actually 13.8). Light can only travel at a given speed, so we can’t see beyond the distance light has traveled during the existence of the universe. But since the universe expanded in all directions, from everywhere all at once, it’s truly infinite. If you were to teleport 14 billion light-years in any direction, you would still see 14 billion years away, since the universe expanded from that point too during the big bang. It’s mindfuck level stuff.