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Showing content from https://docs.unity3d.com/Manual/xr-scene-setup.html below:

Manual: Set up an XR scene

To set up an XRAn umbrella term encompassing Virtual Reality (VR), Augmented Reality (AR) and Mixed Reality (MR) applications. Devices supporting these forms of interactive applications can be referred to as XR devices. More info
See in Glossary sceneA Scene contains the environments and menus of your game. Think of each unique Scene file as a unique level. In each Scene, you place your environments, obstacles, and decorations, essentially designing and building your game in pieces. More info
See in Glossary, add an XR Origin.

These objects are collections of GameObjectsThe fundamental object in Unity scenes, which can represent characters, props, scenery, cameras, waypoints, and more. A GameObject’s functionality is defined by the Components attached to it. More info
See in Glossary and components that provide a frame of reference for transforming spatial tracking data into the scene, including controlling the scene cameraA component which creates an image of a particular viewpoint in your scene. The output is either drawn to the screen or captured as a texture. More info
See in Glossary. When you add an XR Origin to a scene, it controls the attached camera to track the user’s head-mounted (VR) or hand-held (AR) device. In addition, the versions of the XR Origin that contain GameObjects for controllers will move them to track the user’s controllers.

Notes:

• The older XR Rig name has been changed from “rig” to “origin” to better reflect the object’s role in a Unity scene. In addition, the XR Origin component has replaced the Camera Offset component and provides a few additional settings. Refer to XR Origin component for more information.
• The option to Convert Camera to XR Rig still appears in the GameObject > XR menu if you do not have the XR Interaction Toolkit package installed in the project. Although this option still works, Unity recommends using the appropriate XR Origin option from the XR Interaction Toolkit or AR Foundation packages for best compatibility with other XR features.
• The ARAugmented Reality More info
  See in Glossary Session Origin has been replaced by the XR Origin (AR) and XR Origin (Mobile AR) options in version 5 of the AR Foundation package.
• The controller GameObjects included with some XR Origin objects do not have visual componentsA component that enables you to easily create GUI-specific functionality. More info
  See in Glossary, such as a meshThe main graphics primitive of Unity. Meshes make up a large part of your 3D worlds. Unity supports triangulated or Quadrangulated polygon meshes. Nurbs, Nurms, Subdiv surfaces must be converted to polygons. More info
  See in Glossary, and are not configured to receive user input other than tracking data. You must add 3D models and the components or scriptsA piece of code that allows you to create your own Components, trigger game events, modify Component properties over time and respond to user input in any way you like. More info
  See in Glossary necessary to act upon user input, if desired. The XR Interaction Toolkit package provides components for handling user input.

Refer to XR Origin for a description of the XR Origin options available to use in a scene.

Before you can set up a scene for XR, you must first:

• Set up the project for XR.
• Add the AR Foundation to the project, if you are developing an AR app.
• Add the XR Interaction Toolkit package, if you plan to use it (recommended).
• If you use the XR Interaction Toolkit, import the Starter Assets. These assets contain Input System actions and presets that you can use to configure XR controller input.

The basic steps to set up a scene for XR include:

1. Create or open the scene in the Unity Editor.
2. Add one of the XR Origin options to the scene with the GameObject > XR menu. You will see different options in the menu depending on which XR packages you have added to your project. Refer to XR Origin for a description of the available XR Origin options.
3. Configure XR input. Refer to XR input options for more information.

Your projects might have additional setup considerations depending on the project type, platform, and Unity packages that you plan to use:

• For AR projects, refer to Scene setup in the AR Foundation manual for additional set up steps and more detailed instructions.

• For VRVirtual Reality More info
  See in Glossary projects using the XR Interaction Toolkit, refer to General Setup in the Interaction Toolkit manual for additional information.

• For AR/MRMixed Reality
  See in Glossary projects on the Apple Vision Pro, use a Volume Camera instead of an XR Origin. Refer to PolySpatial visionOS: Starting a new visionOS project.

• For VR projects on the Apple Vision Pro, you must add an AR Session object from the AR Foundation package to a scene to access head and hand tracking data. VR apps on this device also have access to additional ARKit data, such as plane detection, scene reconstruction meshes, and image tracking. Refer to Fully Immersive VR on visionOS.

If you have a scene that can be used in both XR and non-XR contexts, you can use the XRSettings.enabled property to detect whether the XR subsystems are currently loaded and active. With that information you can activate or deactivate the appropriate sets of GameObjects and components.

public void CheckXRStatus()
{
    if (UnityEngine.XR.XRSettings.enabled)
    {
        Debug.Log("XR is active.");
    }
    else
    {
        Debug.Log("XR is not available.");
    }
}

Note: you can read the value of the XRSettings.enabled property to determine the XR status. However, setting the value is no longer supported and does nothing. For information about how to dynamically turn XR on and off at runtime, refer to Manage XR loader lifecycles.

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