Deal with extraneous cameras generated by Sketchup Scenes for an XR Rig.

CameraManager.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CameraManager : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        Camera[] allCameras = FindObjectsOfType<Camera>();
        foreach (Camera c in allCameras)
        {
            c.enabled = false;
        }

        Camera vrRig = GameObject.FindGameObjectWithTag("MainCamera").GetComponent<Camera>();
        vrRig.enabled = true;
    }
}