On using the official AdMob Unity plugin, how do I make the ad hidden during the game, but show up in the Main Menu and Game Over Screen ?

In the Main Menu scene, I attached the below code on an empty gameobject, and it successfully requests for ads and shows it during the entire duration of the Main Menu scene. Though, I want to the ads to not show while the game is in progress. For this, I need to call the bannerView.Hide(); function from the Main Menu empty game object, DURING the Game level is on. How do I achieve this ? How do I add a check, that whenever my Game level plays, the banner gets hidden ? PS: Adding a check inside the Update function doesn't work.

The code:

 using System;
 using UnityEngine;
 using GoogleMobileAds;
 using GoogleMobileAds.Api;
 
 // Example script showing how to invoke the Google Mobile Ads Unity plugin.
 public class GoogleMobileAdsDemoScript : MonoBehaviour
 {
     
     private BannerView bannerView;
     private InterstitialAd interstitial;
 
     void Start()
     {
         DontDestroyOnLoad(this);
         RequestBanner ();
         RequestInterstitial ();
         bannerView.Show ();
 if (Application.loadedLevelName == "Game") {
      bannerView.Hide ();
  }
     }
     
     private void RequestBanner()
     {
         #if UNITY_EDITOR
         string adUnitId = "unused";
         #elif UNITY_ANDROID
         string adUnitId = "ca-app-pub-xxxxxxxxxxxxxxxxxxxxxxx";
         #elif UNITY_IPHONE
         string adUnitId = "INSERT_IOS_BANNER_AD_UNIT_ID_HERE";
         #else
         string adUnitId = "unexpected_platform";
         #endif
         
         // Create a 320x50 banner at the top of the screen.
         bannerView = new BannerView(adUnitId, AdSize.SmartBanner, AdPosition.Bottom);
         // Register for ad events.
         bannerView.AdLoaded += HandleAdLoaded;
         bannerView.AdFailedToLoad += HandleAdFailedToLoad;
         bannerView.AdOpened += HandleAdOpened;
         bannerView.AdClosing += HandleAdClosing;
         bannerView.AdClosed += HandleAdClosed;
         bannerView.AdLeftApplication += HandleAdLeftApplication;
         // Load a banner ad.
         bannerView.LoadAd(createAdRequest());
     }
     
     private void RequestInterstitial()
     {
         #if UNITY_EDITOR
         string adUnitId = "unused";
         #elif UNITY_ANDROID
         string adUnitId = "ca-app-pub-xxxxxxxxxxxxxxxxxxxxxxxx";
         #elif UNITY_IPHONE
         string adUnitId = "INSERT_IOS_INTERSTITIAL_AD_UNIT_ID_HERE";
         #else
         string adUnitId = "unexpected_platform";
         #endif
         
         // Create an interstitial.
         interstitial = new InterstitialAd(adUnitId);
         // Register for ad events.
         interstitial.AdLoaded += HandleInterstitialLoaded;
         interstitial.AdFailedToLoad += HandleInterstitialFailedToLoad;
         interstitial.AdOpened += HandleInterstitialOpened;
         interstitial.AdClosing += HandleInterstitialClosing;
         interstitial.AdClosed += HandleInterstitialClosed;
         interstitial.AdLeftApplication += HandleInterstitialLeftApplication;
         // Load an interstitial ad.
         interstitial.LoadAd(createAdRequest());
     }
     
     // Returns an ad request with custom ad targeting.
     private AdRequest createAdRequest()
     {
         return new AdRequest.Builder()
             .AddTestDevice(AdRequest.TestDeviceSimulator)
                 .AddTestDevice("9ACD01B470951161A30C0AA4B6DA3A7D")
                 .AddKeyword("game")
                 .SetGender(Gender.Male)
                 .SetBirthday(new DateTime(1985, 1, 1))
                 .TagForChildDirectedTreatment(false)
                 .AddExtra("color_bg", "9B30FF")
                 .Build();
         
     }
     
     private void ShowInterstitial()
     {
         if (interstitial.IsLoaded())
         {
             interstitial.Show();
         }
         else
         {
             print("Interstitial is not ready yet.");
         }
     }
     
     #region Banner callback handlers
     
     public void HandleAdLoaded(object sender, EventArgs args)
     {
         print("HandleAdLoaded event received.");
     }
     
     public void HandleAdFailedToLoad(object sender, AdFailedToLoadEventArgs args)
     {
         print("HandleFailedToReceiveAd event received with message: " + args.Message);
     }
     
     public void HandleAdOpened(object sender, EventArgs args)
     {
         print("HandleAdOpened event received");
     }
     
     void HandleAdClosing(object sender, EventArgs args)
     {
         print("HandleAdClosing event received");
     }
     
     public void HandleAdClosed(object sender, EventArgs args)
     {
         print("HandleAdClosed event received");
     }
     
     public void HandleAdLeftApplication(object sender, EventArgs args)
     {
         print("HandleAdLeftApplication event received");
     }
     
     #endregion
     
     #region Interstitial callback handlers
     
     public void HandleInterstitialLoaded(object sender, EventArgs args)
     {
         print("HandleInterstitialLoaded event received.");
     }
     
     public void HandleInterstitialFailedToLoad(object sender, AdFailedToLoadEventArgs args)
     {
         print("HandleInterstitialFailedToLoad event received with message: " + args.Message);
     }
     
     public void HandleInterstitialOpened(object sender, EventArgs args)
     {
         print("HandleInterstitialOpened event received");
     }
     
     void HandleInterstitialClosing(object sender, EventArgs args)
     {
         print("HandleInterstitialClosing event received");
     }
     
     public void HandleInterstitialClosed(object sender, EventArgs args)
     {
         print("HandleInterstitialClosed event received");
     }
     
     public void HandleInterstitialLeftApplication(object sender, EventArgs args)
     {
         print("HandleInterstitialLeftApplication event received");
     }
     
     #endregion
 }