How can I change completely the scene?

Hello friends,
I’m doing a question tipically of a noob. But I’m starting in the programming of games and in Unity3d too. I have to say this is awesome, but I have this problem, I can’t change the scene without delete the previous scene and their objects.
I have a Trigger in a location of the screen, and an event, the events makes change the scene when the mouse is pressed into the trigger, but when it happends, the scene changes but the colors and objects are mixed with the “current” scene. How can I fix it?
The code below is the same I have in the event (and using the same script in both scenes):

        *Scene escenaActual = SceneManager.GetActiveScene();
        string nombreDeEscena = escenaActual.name;
        Debug.Log(nombreDeEscena);
        if (nombreDeEscena == "scene2")
        {
            
            Application.Quit();
            SceneManager.LoadScene("scene", LoadSceneMode.Additive);
            
            
        }
        else if (nombreDeEscena == "scene")
        {
            Application.Quit();
            SceneManager.LoadScene("scene2", LoadSceneMode.Additive);
        }*

Go to File, save scene as, then save to the Unity Game Location

Go to: Documents, " The Projects Name" then name the scene

You can then save it and make a new scene

*** I hope this helps… I would wait for another person to answer because It’s always good to get even more help***

Also, make sure that you let me know if it works, just want to make sure your problem is solved…