Simple utility script that allows to quickly switch to Unity build behaviour in the editor.

PlayModeSceneMenu.cs

using UnityEditor;
using UnityEditor.SceneManagement;
using UnityEngine.SceneManagement;

public static class PlayModeSceneMenu
{
    private const string PrefKey = "PLAY_MODE_SCENE_SELECTION";
    private const string Path = "Play Mode Scene/";
    private const string MenuDefault = "Default (Open Scene)";
    private const string MenuEmulate = "Emulate Build Behaviour";
    
    private static string SelectedPlayModeScene
    {
        get => EditorPrefs.GetString(PrefKey, MenuDefault);
        set => EditorPrefs.SetString(PrefKey, value);
    }

    [InitializeOnLoadMethod]
    private static void InitializeSelection()
    {
        switch (SelectedPlayModeScene)
        {
            case MenuDefault:
                SelectDefault();
                break;
            case MenuEmulate:
                SelectEmulateBuild();
                break;
        }
    }

    private static SceneAsset GetSceneAssetByIndex(int buildIndex)
    {
        string path = SceneUtility.GetScenePathByBuildIndex(buildIndex);
        return AssetDatabase.LoadAssetAtPath<SceneAsset>(path);
    }
    
    private static void CheckItemIfSelected(string value)
    {
        bool isSelected = SelectedPlayModeScene == value;
        Menu.SetChecked(Path + value, isSelected);
    }

    [MenuItem(Path + MenuDefault)]
    public static void SelectDefault()
    {
        EditorSceneManager.playModeStartScene = null;
        SelectedPlayModeScene = MenuDefault;
    }
    
    [MenuItem(Path + MenuDefault, true)]
    public static bool SelectDefaultValidator()
    {
        CheckItemIfSelected(MenuDefault);
        return true;
    }

    [MenuItem(Path + MenuEmulate)]
    public static void SelectEmulateBuild()
    {
        EditorSceneManager.playModeStartScene = GetSceneAssetByIndex(0);
        SelectedPlayModeScene = MenuEmulate;
    }
    
    [MenuItem(Path + MenuEmulate, true)]
    public static bool SelectEmulateBuildValidator()
    {
        CheckItemIfSelected(MenuEmulate);
        return true;
    }
}