Why are Actors not showing up in the viewport but are in the scene outliner?

Development Rendering
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12

Okay found a way:
I. Search for “part” in the world settings of your level
II. Reset the “Default World Partition Settings”
III. ENABLE Streaming
IV. Click “No” when asked to load documentation
V. Disable Streaming again

=> Suddenly 20 assets I have totally forgotten about showed up in my scene outliner crowding my scene, LOL