Go to : Content/PortalTeleport/Blueprints/Portals/BP_LevelStreamerManager
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What is Level Streamer Manager?
The manager who is permanently located on the Base Level and controls the level transition portals and connects with the user interface.
Starting Level -> Load target level when game starting.
Fade Speed -> Level transition speed.
Go to : Content/PortalTeleport/Blueprints/Portals/BP_LevelStreamerPortal
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What is Level Streamer Portal?
The portal who is load streaming level and located on the Base Level.
Connected Level -> Loading level.
Connected Level Streamer -> Target the level and portal.