Hello, drafter,
The reason the camera zooms is because after the last domino falls, it unfortunately penetrates the ground, and keeps falling until it makes the camera bounds too large for the view. What you can do is adjust simulation settigns to prevent the unwanted penetration.
To make adjustements to simulation settings, open MSPhysics UI, activate Simulation tab, and do the following:
Change Update Timestep to "x1/2 (1/120)"
Change World Scale to 10
Also, unrelated to MSPhysics, I noticed the camera was set to parallel projection. You can change it to perspective if thats desired, by navigativing to and selecting (Menu) Camera->Perspective.
Anton