When the camera is not selected, there is no frame. When selected, there is a frame. Gizmo is on. I just created a new project, didn’t touch anything else
The problem was solved by imposing a script on the camera (one guy helped me)
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class CameraScript : MonoBehaviour
{
// Start is called before the first frame update
void OnDrawGizmos()
{
float verticalHeightSeen = GetComponent<Camera>().orthographicSize * 2.0f;
float verticalWidthSeen = verticalHeightSeen * GetComponent<Camera>().aspect;
Gizmos.color = Color.gray;
Gizmos.DrawWireCube(transform.position, new Vector3(verticalWidthSeen,verticalHeightSeen,0));
}
}

