Buttons still "Clickable" after disabling their parent canvas

I am using a laser pointer attached to my vive controller to select buttons off a world space canvas. I did this by attaching a box collider to each button and then using a physics collider. The problem is that when I disable one canvas to go to a different screen, the buttons for canvases that have been deactivated remain active (even though they are not visible on the screen. How do I make sure that the colliders are no longer active after I disable the parent canvas?

 using UnityEngine;
 using System.Collections;
 using UnityEngine.SceneManagement;
 
 public class ItemSelection : MonoBehaviour {
 
     public SteamVR_TrackedObject rightController;
     public Canvas MainMenu;
     public Canvas MPMenu;
     public Canvas OptionsMenu;
     public Canvas ExitMenu;
     public Canvas TutorialMenu;
 
     void Awake ()
     {
         MainMenu.enabled = true;
         MPMenu.enabled = false;
         OptionsMenu.enabled = false;
         ExitMenu.enabled = false;
         TutorialMenu.enabled = false;
         rightController = GetComponent<SteamVR_TrackedObject>();
         MainMenu = MainMenu.GetComponent<Canvas>();
         MPMenu = MPMenu.GetComponent<Canvas>();
         OptionsMenu = OptionsMenu.GetComponent<Canvas>();
         ExitMenu = ExitMenu.GetComponent<Canvas>();
         TutorialMenu = TutorialMenu.GetComponent<Canvas>();
     }
     
 
     void Update ()
     {
         if(IsTriggerDown.IsRightDown)
         {
             Debug.Log("trigTracker is starting");
             RaycastHit hit;
             Ray shootingRay = new Ray(rightController.transform.position, rightController.transform.forward);
             if (Physics.Raycast(shootingRay, out hit, 5f))
             {
                 if (hit.collider.tag == ("SPButton"))
                 {
                     SceneManager.LoadScene(1);
                     IsTriggerDown.IsRightDown = false;
                 }
                 else if (hit.collider.tag == ("MPButton"))
                 {
                     Debug.Log("You hit the MP Button");
                     MainMenu.enabled = false;
                     MPMenu.enabled = true;
                     IsTriggerDown.IsRightDown = false;
                 }
                 else if (hit.collider.tag == ("TutorialButton"))
                 {
                     MainMenu.enabled = false;
                     TutorialMenu.enabled = true;
                     IsTriggerDown.IsRightDown = false;
                     Debug.Log("You hit the Tutorial Button");
                 }
                 else if (hit.collider.tag == ("OptionsButton"))
                 {
                     MainMenu.enabled = false;
                     OptionsMenu.enabled = true;
                     IsTriggerDown.IsRightDown = false;
                     Debug.Log("You hit the Options Button");
                 }
                 if (hit.collider.tag == ("ExitButton"))
                 {
                     MainMenu.enabled = false;
                     ExitMenu.enabled = true;
                     IsTriggerDown.IsRightDown = false;
                     Debug.Log("You hit the Exit Button");
                 }
                 if (hit.collider.tag == ("ReturnMenu"))
                 {
                     MPMenu.enabled = false;
                     OptionsMenu.enabled = false;
                     ExitMenu.enabled = false;
                     TutorialMenu.enabled = false;
                     MainMenu.enabled = true;
                     IsTriggerDown.IsRightDown = false;
                     Debug.Log("You hit the Return to Menu Button");
                 }
                 if (hit.collider.tag == ("YesExButton"))
                 {
                     Application.Quit();
                     Debug.Log("You hit the Exit Button");
                 }
 
                 else
                 {
                     Debug.Log("You missed UI Buttons");
                 }
             }
         }
     }
 }