FrameWorkDesign/Assets/Scripts/UI/GameStartPanel.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class GameStartPanel : MonoBehaviour
{
    public GameObject Enemies;
    private void Start()
    {
        transform.Find("BtnStart").GetComponent<Button>()
            .onClick.AddListener(() =>
            {
                gameObject.SetActive(false);

                GameSrartEvent.Trigger();
            });
    }
}