Resolution appears incorrect when using Windows Mixed reality Simulator

Resolution appears incorrect when using Windows Mixed reality Simulator. It appears to only take up around 1/4 the available screen space.

1. Make sure that Window Mixed Reality portal is setup
2. Enable Develop mode (for windows 10(settings > updates & security > For Developers))
3. Make sure Mixed Reality for Steam VR is setup and running
4. Open Windows mixed reality portal
5. Click the for developers button
6. Turn on the headset and controller (within the WMR portal)
7. Open the editor
8. Disable the oculus VR plugin
9. Enable Mixed Reality plugin
10. Restart Editor
11. Play in VR mode

Result: The game only renders in around 1/4 of the available screen space (see image)
Expected: The preview of the game would render so that it takes up the full screen space available