问如何修复播放模式后检查器中缺少的音频按钮？

EN

using UnityEngine;
using UnityEngine.UI;
public class AudManager : MonoBehaviour
{
    public Button soundBtn;
    public Sprite musicOn;
    public Sprite musicOff;
    public AudioSource _audio;
    public static AudManager instance;

    public void Awake()
    {
        MakeSingleton();

    }

    void MakeSingleton()
    {
       
         if (instance != null)
        {
            Destroy(gameObject);
        } else
        {
            instance = this;
            DontDestroyOnLoad(gameObject);
        }
       
     
           
       
     }
     public void Start()
    {

        if (_audio.mute == true)
        {
            soundBtn.GetComponent<Image>().sprite = musicOff;
        }
        else
        {
            soundBtn.GetComponent<Image>().sprite = musicOn;
        }
    }

    public void SoundControl()
    {
   
        if (_audio.mute == true)
        {
            _audio.mute = false;
            soundBtn.GetComponent<Image>().sprite = musicOn;
            Debug.Log("soundBtn");
        }
            else
        {
            _audio.mute = true;
            soundBtn.GetComponent<Image>().sprite = musicOff;
            Debug.Log("soundBtn");
        }
    }
    
}