Streaming Levels are managed through the Levels window. They can overlap your persistent Level, or be offset to create larger worlds. Each
streaming Level can be set to Always Loaded or Blueprint for the streaming type. This setting can be toggled in the Levels window by right-clicking on the sublevel.
When a streaming Level is set to Always Loaded, it is loaded together with the persistent Level. It also becomes visible at the same time as the persistent Level.
It ignores streaming volumes assigned to it, as well as any loading or unloading requests sent from Blueprints or C++. This type of sublevel is often used for splitting
content that would ordinarily be in the persistent Level into multiple "layers", so artists can collaborate working in parallel without blocking each other. For more information on this workflow,
see Collaborate with Sublevels. In game, an Always Loaded sublevel is never streamed out, unless the game changes the persistent Level.