CommitMapChange Finished but not delete actors the actors of the previous map

Development Programming & Scripting Blueprint
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1

Hi,
I used How do I use PrepareMapChange/CommitMapChange?

to change One map to another, but When I Load the Map, my old Map is not unloaded. So I have 2 Level Blueprints that are running at the same time. How should I unload the old Map?

2

If possible, can I get some demo for this,Thanks!!