Fullscreen game window in unity editor

Fullscreen.cs

#if UNITY_EDITOR

using System;
using System.Reflection;
using UnityEditor;
using UnityEngine;

public class FullscreenHotkeyHandler : MonoBehaviour
{
    bool makeFullscreenAtStart = true;
	
	// Enable fullscreen when starting game
    void Start() { if (makeFullscreenAtStart) { FullscreenGameView.Toggle(); } }

    void Update() 
    {
		// Toggle fullscreen when hotkey pressed
        if (Input.GetKeyDown(KeyCode.Backslash))
        {
            FullscreenGameView.Toggle();
        }
    }
}

// Below code from: https://gist.github.com/fnuecke/d4275087cc7969257eae0f939fac3d2f
// My Improvement: Fixed bug where stuck in fullscreen after re-compiling
public static class FullscreenGameView
{
    static readonly Type GameViewType = Type.GetType("UnityEditor.GameView,UnityEditor");
    static readonly PropertyInfo ShowToolbarProperty = GameViewType.GetProperty("showToolbar", BindingFlags.Instance | BindingFlags.NonPublic);
    static readonly object False = false; // Only box once. This is a matter of principle.

    static EditorWindow instance;

    // Exit fullscreen when re-compiling game during Game session (to fix bug where can't leave fullscreen)
    static FullscreenGameView() { AssemblyReloadEvents.beforeAssemblyReload += OnBeforeAssemblyReload; }
    private static void OnBeforeAssemblyReload() { if (instance != null) { instance.Close(); instance = null; } }
    
    [MenuItem("Window/General/Game (Fullscreen) %#&2", priority = 2)]
    public static void Toggle()
    {
        if (GameViewType == null)
        {
            Debug.LogError("GameView type not found.");
            return;
        }

        if (ShowToolbarProperty == null)
        {
            Debug.LogWarning("GameView.showToolbar property not found.");
        }

        if (instance != null)
        {
            instance.Close();
            instance = null;
        }
        else
        {
            instance = (EditorWindow) ScriptableObject.CreateInstance(GameViewType);

            ShowToolbarProperty?.SetValue(instance, False);

            var desktopResolution = new Vector2(Screen.currentResolution.width, Screen.currentResolution.height);
            var fullscreenRect = new Rect(Vector2.zero, desktopResolution);
            instance.ShowPopup();
            instance.position = fullscreenRect;
            instance.Focus();
        }
    }
}

#endif

did and updated version with F4 as togglekey and it fixes the invalid operation exception with the input class, if anyone else crosses with that same error