public class DisableInputSystemTest : MonoBehaviour
{
    private IMixedRealityInputSystem inputSystem = null;
    private IMixedRealityInputSystem InputSystem
    {
        get
        {
            if (inputSystem == null)
            {
                MixedRealityServiceRegistry.TryGetService<IMixedRealityInputSystem>(out inputSystem);
            }
            return inputSystem;
        }
    }

    public void DisableInputSystem()
    {
        InputSystem.Disable();
    }

    public void EnableInputSystem()
    {
        InputSystem.Enable();
    }
}

MixedRealityInputSystemProfile profile = ConfigurationProfile as MixedRealityInputSystemProfile;

            if (profile.PointerProfile != null)
            {
                if (profile.PointerProfile.GazeProviderType?.Type != null)
                {
                    GazeProvider = CameraCache.Main.gameObject.EnsureComponent(profile.PointerProfile.GazeProviderType.Type) as IMixedRealityGazeProvider;
                    GazeProvider.GazeCursorPrefab = profile.PointerProfile.GazeCursorPrefab;
                    // Current implementation implements both provider types in one concrete class.
                    EyeGazeProvider = GazeProvider as IMixedRealityEyeGazeProvider;
                }
                else
                {
                    Debug.LogError("The Input system is missing the required GazeProviderType!");
                    return;
                }
            }
            else
            {
                Debug.LogError("The Input system is missing the required Pointer Profile!");
                return;
            }