I’m going through the World Composition User Guide and I have checked Enable World Composition in the World Settings. Under the Minimap section, it reads:
The first time a level is loaded in World Composition, a new Level Bounds Actor is automatically created in the level. The Level Bounds Actor is used to calculate the size of the level.
But I see no Level Bounds Actors in any of my levels. Consequently, my Levels Composition window is totally blank.
So I found the actor and manually dragged it into my world, which causes my world to render in the level composition window. I will do this for all of my levels, but I feel it should be automated, as the documentation teases.