Hololens2 Unity App is displayed in a 2D Window (MRTK 2.8.2.0 Unity Version : 2020.3.28 f1)

Hi  I have been trying to deploy to Hololens 2.  But the app opens in a 2d window inside hololens.  I am following the Hololens 2 fundamental tutorial here https://learn.microsoft.com/en-us/traini...