"Resolution" switches back to FullScreen and NativeResolution

Guys. I have a picle and my eyes are squared already.

Everything works - within Menu I can switch the Resolution and FullScreen On/Off. The problem is, that upon new load, the game does show a right size window at first [the one I chose at previous launch of the game - smaller, non-FullScreen], but then switches back to Native Res FullScreen.

And I have tried gazillion things... I just cannot see straight anymore.. Help. Sorry for the commented out mess - just trying different things...

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.UI;
5. using TMPro;
6. using System.Linq;
7.  
8. public class SettingsMenu : MonoBehaviour
9. {
10.     public TMP_Dropdown resolutionDropdown;
11.     Resolution[] resolutions;
12.     Resolution selectedResolution; //added
13.     bool isFullScreen;
14.    
15.     private const string resolutionWidthPlayerPrefKey = "ResolutionWidth";//added
16.     private const string resolutionHeightPlayerPrefKey = "ResolutionHeight";//added
17.     private const string isFullScreenPlayerPrefKey = "isFullScreenPlayerPrefKey"; //2
18.     private void Awake()
19.     {
20.         //    Invoke("SetResolution", 0f);
21.         //    Invoke("SetFullScreen", 0);
22.         //PlayerPrefs.GetInt("isFullscreen", (isFullScreen ? 1 : 0));
23.     }
24.     private void Start()
25.     {
26.         resolutions = Screen.resolutions.Select(resolution => new Resolution { width = resolution.width, height = resolution.height }).Distinct().ToArray();
27.         resolutionDropdown.ClearOptions();
28.         List<string> options = new List<string>();
29.        
30.         int currentResolutionIndex = 0;
31.         for (int i = 0; i < resolutions.Length; i++)
32.         {
33.             string option = resolutions[i].width + " x " + resolutions[i].height;
34.             options.Add(option);
35.  
36.             if (resolutions[i].width == Screen.currentResolution.width && resolutions[i].height == Screen.currentResolution.height)
37.             {
38.                 currentResolutionIndex = i;
39.             }
40.         }
41.         resolutionDropdown.AddOptions(options);
42.         resolutionDropdown.value = currentResolutionIndex;
43.         resolutionDropdown.RefreshShownValue();
44.  
45.        
46.         //selectedResolution = new Resolution(); //added 9
47.         selectedResolution.width = PlayerPrefs.GetInt(resolutionWidthPlayerPrefKey, Screen.currentResolution.width); //added 13
48.         selectedResolution.height = PlayerPrefs.GetInt(resolutionHeightPlayerPrefKey, Screen.currentResolution.height); //added 13
49.         //Screen.fullScreen = isFullScreen; //12
50.         //PlayerPrefs.GetInt(isFullScreenPlayerPrefKey); //12 14
51.         //Screen.fullScreen = isFullScreen;//7 8
52.         // PlayerPrefs.GetInt("isFullScreenPlayerPrefKey", (isFullScreen ? 1 : 0));//7 11 isFullScreenPlayerPrefKey 13off
53.         //Invoke("SetFullScreen", 0); //6
54.         //Invoke("SetFullScreen", 0);
55.     }
56.  
57.     public void SetResolution(int resolutionIndex)
58.     {
59.         Resolution resolution = resolutions[resolutionIndex];
60.         Screen.SetResolution(resolution.width, resolution.height, Screen.fullScreen);
61.  
62.         PlayerPrefs.SetInt(resolutionWidthPlayerPrefKey, resolution.width);//added
63.         PlayerPrefs.SetInt(resolutionHeightPlayerPrefKey, resolution.height);//added
64.         //Invoke("SetFullScreen", 0f); //added
65.     }
66.     public void SetFullScreen(bool isFullScreen)
67.     {
68.         Screen.fullScreen = isFullScreen;
69.         PlayerPrefs.SetInt("isFullScreenPlayerPrefKey", (isFullScreen ? 1 : 0)); //added1520 1550off 2 4 7get 11 isFullScreenPlayerPrefKey
70.  
71.         //PlayerPrefs.SetInt("isFullscreen", (isFullScreen ? 1 : 0)); //added 1550on 2
72.         // isFullScreen = (PlayerPrefs.GetInt("isFullscreen") != 0); //added1449 1542 3
73.  
74.     }
75.  
76. }
77.