Showcase Autoshowroom Template for VR

Hi Everyone, for my thesis I need to do an experiment with an autoshowroom in VR. I found out, that there is a nice and realistic template provided from Unity (Version 2020.3.41f1).
When creating a new project with this template and run the playmode, it shows me the game only in 2D. I started with adding the whole setting with the XR Interaction Toolkit and was finally able to walk at least arround the car.
Now I want to open the doors and trunk but after watching multiple tutorial, it won't work - i didn't find any tutorial for that. The whole showroom should be playable only Quest 2.
Have anyone adapted the Unity template "autoshowroom" for VR use and can provide some help for me?