The GetAllLoadedScenes() Method

About

This method extends SceneManager.

This method returns all current loaded scenes as a Scene array.

This method can be used for replacing the obsolete SceneManager.GetAllScenes() method.

Example

// This script unloads all loaded scenes except a scene with a specified name.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
using NUDev.PlusSharp;

public class UnloadAllScenesExcept : MonoBehaviour {

    public string scene;
    private SceneManager scm;

	void Start () {
        scm = new SceneManager();
        StartCoroutine(Unload());
	}
	
	IEnumerator Unload () {
        Scene[] scs = scm.GetAllLoadedScenes();
        for (int i = 0; i < scs.Length; i++)
        {
            if (scs[i].name != scene)
            {
                yield return SceneManager.UnloadSceneAsync(scs[i].name);
            }
        }
    }
}