what difference between open level and load streaming level in ue4
Open level destroys old world and loads new one, like in any other game.
Level streaming loads another level on top of one loaded, the level you opened becomes so called “persistent level” it kind of root of your world, but that would could be as well empty and you only control loaded levels in it. Level streaming allows you to separate level in to fragments, which can be dynamically loaded and unloaded, and you can create seamless transitions between them, creating illusion of one huge big level… those word should give you the idea. Ofcorse this can be also used for any forms of optimizations you can think of, as you can control which portion of the world is loaded and unloaded
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Thank-you for the explanation