Back button on Android returns to the main menu

Assets/Scripts/UX/BackButton.cs

-using System.Collections;
-using System.Collections.Generic;
-using UnityEngine;
+using UnityEngine;
-using UnityEngine.XR.ARFoundation;
-using UnityEngine.XR.Management;
 
 namespace UnityEngine.XR.ARFoundation.Samples
 {
         GameObject m_BackButton;
         public GameObject backButton
         {
-            get { return m_BackButton; }
-            set { m_BackButton = value; }
+            get => m_BackButton;
+            set => m_BackButton = value;
         }
 
         void Start()
             }
         }
 
+        void Update()
+        {
+            if (Input.GetKeyDown(KeyCode.Escape))
+            {
+                BackButtonPressed();
+            }
+        }
+
-            SceneManager.LoadScene("Menu", LoadSceneMode.Single);
-            LoaderUtility.Deinitialize();
+            if (Application.CanStreamedLevelBeLoaded("Menu"))
+            {
+                SceneManager.LoadScene("Menu", LoadSceneMode.Single);
+                LoaderUtility.Deinitialize();
+            }
         }
     }
 }