Go to the "Options" menu, then click "Gameplay", and turn on the "Head Bobbing" feature. It's on while it's green. For color-blind people, you'll know it's on while the little handle is on the right side.

Many of us don't like the "Head Bobbing" feature that many games have, but I would rather have that enabled than be pulled out of the immersion of the surroundings by unintentionally seeing through walls and other objects.

I hope this works for you. I haven't played through the whole game again to check every boundary.