How to apply subtitle settings to an entire game?,How to apply subtitle settings to the entire game?

So I have a basic script with hard coded subtitles and a settings menu. My goal is that when the player say, choses to turn the subtitles on/off in the menu, those settings are applied to the entire game.

Here is my subtitle code:

    public GameObject textBox;        
    void Start()
    {
        StartCoroutine(TheSequence());
    }

    IEnumerator TheSequence()
    {
        Debug.Log("Subtitles script reached");
        //wait for 1 seconds before showing text
        yield return new WaitForSeconds(1);
        textBox.GetComponent<Text>().text = "Test Subtitle";
        //wait for three seconds before changing text 
        yield return new WaitForSeconds(3);
        textBox.GetComponent<Text>().text = "";
        yield return new WaitForSeconds(1);
        textBox.GetComponent<Text>().text = "Test Subtitle";
    }

I used to have a button in scene that toggled the subtitles on/off that looked like:

 public bool isSubtitle = true;
public void ToggleSubs()
    {
        if (isSubtitle == false)
        {
            textBox.SetActive(true);
            isSubtitle = true;
            return;
        }
        if (isSubtitle == true)
        {
            textBox.SetActive(false);
            isSubtitle = false;
            return;
        }
    },So I have a very basic subtitle script and a menu. My goal is to make it so that when a user changes the settings in the menu, that they change to reflect that in the entire game. 

I.e. turn subtitles on/off for the whole game

This is my script for the subtitles.

    public GameObject textBox;
    public bool isSubtitle = true;
     
void Start()
    {
        StartCoroutine(TheSequence());
    }

    IEnumerator TheSequence()
    {
        Debug.Log("Subtitles script reached");
        //wait for 1 seconds before showing text
        yield return new WaitForSeconds(1);
        textBox.GetComponent<Text>().text = "Test subtitle";
        //wait for three seconds before changing text 
        yield return new WaitForSeconds(3);
        textBox.GetComponent<Text>().text = "";
        yield return new WaitForSeconds(1);
        textBox.GetComponent<Text>().text = "Test subtitle 2";
    }

I used to have a button in the scene itself to toggle whether they were on or off that looked like this.

public void ToggleSubs()
    {
        if (isSubtitle == false)
        {
            textBox.SetActive(true);
            isSubtitle = true;
            return;
        }
        if (isSubtitle == true)
        {
            textBox.SetActive(false);
            isSubtitle = false;
            return;
        }
    }

However as stated before, this has to be in the scene, and I want a settings menu that applies this setting to the whole game