well if your zoom is reset you will hardly make them on one screen because they are simply spotted too far away from each other.
If you like the way you have spotted them I would sugest to not change the scene but use pan and zoom on the person who speaks. It will look dinamic and I bet reader will even like it more than look on one static scene.
If you need to see them both you will have to spot them on another place to see both in one zone.
Also sometimes works to be in the zone which is more right then reset zoom and then zoom bit to left.
If you will not touch the focus you will see bit between the zones. But you cant adjust it with focus so it works more by accident sometimes.