How to disable a setting using dat.GUI in three.js?

Question

JavaScript

I wrote this code

var option_default = function() { 
this.cam_four = false ;
};
var option_array = new option_default(); 
var opt_none ;  
var gui = new dat.GUI({ autoPlace: false }); 

var action_cam_four = gui.add(option_array, "cam_four"); 
action_cam_four.onFinishChange( function (opt_none) {
  if (opt_none== true){
    camera = new THREE.ArrayCamera( cameras ); 	
  }  
  if (opt_none== false){	
    cameras.enabled = true		
  }  
} );

var camera = new THREE.PerspectiveCamera(65,  window.innerWidth / window.innerHeight, 0.1, 1000 ); // создание камеры с значениями по умолчанию
  camera.position.z= 1; camera.position.x= 0; camera.position.y= 0.5;		// изменеия позиций камеры
  
   
 
  var AMOUNT = 2;  
  var SIZE = 1 / AMOUNT;
  var cameras = [];
    
  for ( var y = 0; y < AMOUNT; y ++ ) {
  for ( var x = 0; x < AMOUNT; x ++ ) {
            var subcamera = new THREE.PerspectiveCamera(65,  window.innerWidth / window.innerHeight, 0.1, 1000 );
            subcamera.bounds = new THREE.Vector4( x / AMOUNT, y / AMOUNT, SIZE, SIZE ); 
            
           
            cameras.push( subcamera );		 
}} 


   cameras[2].position.z = 3 ; cameras[2].position.x = 0; cameras[2].position.y = 1.5 ;
   cameras[2].updateMatrixWorld();		
    
   cameras[1].position.z = 3 ; cameras[1].position.x = 0 ; cameras[1].position.y = 0 ;
   cameras[1].updateMatrixWorld();
   
   cameras[0].position.z = 0 ; cameras[0].position.x = 3 ; cameras[0].position.y = 0 ;
   cameras[0].updateMatrixWorld();
   
   cameras[3].position.z = 0 ; cameras[3].position.x = 0 ; cameras[3].position.y = 3 ;
   cameras[3].updateMatrixWorld();

The problem is that I don't fully understand how to disable new THREE.ArrayCamera(cameras ); and similar functions.
Can anyone help me?