Scriptum/Assets/OpenSettingsOnESCPress.cs

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

public class OpenSettingsOnESCPress : MonoBehaviour
{
    public GameObject SettingsMainPanel;
    public GameObject SettingsPanel;
    public GameObject SoundsPanel;
    public GameObject ControlsPanel;
    public GameObject LanguagePanel;

    void Update()
    {
        //KeyCode keyToSettings = (KeyCode) System.Enum.Parse(typeof(KeyCode), PlayerPrefs.GetString("Settings"));
        if (Input.GetKeyUp(KeyCode.Escape))
        {
            if ((SettingsMainPanel.active == false) && (SettingsPanel.active == false) && (SoundsPanel.active == false) && (ControlsPanel.active == false) && (LanguagePanel.active == false)) 
            { 
                SettingsMainPanel.SetActive(true);
            }
            else
            {
                SettingsMainPanel.SetActive(false);
                SettingsPanel.SetActive(false);
                SoundsPanel.SetActive(false);
                ControlsPanel.SetActive(false);
                LanguagePanel.SetActive(false);
            }
        }
    }
}