Chrome OS Linux VM: Mouse isn't constrained by Minecraft

I have installed Minecraft through the Linux VM on my chromebook. However, when I tried to use my mouse to look around, it would encounter the borders of the screen and not allow me to look any farther that way.

What I expected to happen was:

I expected to be able to use my mouse for full 360 degree viewing, with my mouse not stopping.

What actually happened was:
My mouse would allow me to view 100 degrees left and right, and 55 degrees up and down

Steps to reproduce:
1. Install Minecraft on a Linux VM
2. Attempt to look around 360 degrees
3. If that returns successful, use a Chrome OS VM, and use the integrated Linux VM to retry.