I want Toggle Group Savescript. When i restart the game. the game disable all toggle.

 using System.Collections;
 using UnityEngine.UI;
 using UnityEngine;
 
 public class Graphics_setting : MonoBehaviour {
 
     public Toggle low;
     public Toggle medium;
     public Toggle high;
 
 
     void Awake()
     {
         ActiveToggle ();
     }
 
     public void ActiveToggle () 
     {
         if (low.isOn) 
         {
             QualitySettings.SetQualityLevel (0, true);
             FindObjectOfType<AudioManager>().Play("Click");
         }
         else if (medium.isOn) 
         {
             QualitySettings.SetQualityLevel (3, true);
             FindObjectOfType<AudioManager>().Play("Click");
         }
         else if (high.isOn) 
         {
             QualitySettings.SetQualityLevel (5, true);
             FindObjectOfType<AudioManager>().Play("Click");
         }
     }
 }
 

when i select graphic setting in game. it's all working but when i close the game and restart the toggle is off and unity use it's own quality setting. i want save graphic setting. Please give me script not references i already search and apply too many of them.