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If you check out the documentation for Application.Quit it starts by saying this:
Quits the player application. Shut down the running application. The Application.Quit call is ignored in the Editor.
Application.Quit does nothing if you test inside the editor.
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load the next scene offscreen
Usually we switch scenes with get_tree().change_scene("res://Main.tscn");. We are not going to do that. Instead we will load the new scene as a resource (PackedScene) and then switch.
You can load the scene in a single call of load on the resource_loader, but that could mean a noticeable hiccup.
Instead, you could use ...
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