UPDATED TO UNITY 2022.2.15f1

please please please make sure this is opened in the right unity version or it will give you problems :)

Assets/Scripts/EnemyPatrol.cs

@@ -27,4 +27,9 @@ public class EnemyPatrol : MonoBehaviour {
             transform.position += new Vector3(movementVector.x, 0, 0) * Time.deltaTime;
         }
     }
+
+    void OnDrawGizmos() {
+        Gizmos.color = Color.green;
+        Gizmos.DrawLine(new Vector3(transform.position.x - range, transform.position.y, transform.position.z), new Vector3(transform.position.x + range, transform.position.y, transform.position.z));
+    }
 }