TimeStop.cs

using UnityEngine;

/*
  https://gamedevbeginner.com/the-right-way-to-pause-the-game-in-unity/#:~:text=The%20most%20convenient%20method%20for%20pausing%20the%20game,will%20return%20the%20game%20to%20its%20normal%20speed.
*/

public class TimeStop : MonoBehaviour
{
    public bool checkTimeToStop;


    void Start()
    {
        PauseGame();
    }

    private void Update()
    {
        if (checkTimeToStop == true)
            PauseGame();
    }

    private void PauseGame()
    {
        UIconfig.GamePaused = true;
        Time.timeScale = 0;
    }
}