Packaging a world composition level?

Does anyone know how to package a world composition level? In project settings i set the world comp Umap as the level to package but it packaged a different level apparently. Is there something i am missing?

Does anyone think that for a 4033 (4k) map , i would actually need to use World Composition? I mean after putting foliage and static mesh’s and filling the world up with things, i would have a problem with memory or performance on that size map?

A 4k map isn’t really a highres map but it can be if you scale it accordingly. iirc the 4k determines the size on the X and Y axis- 4k = 4 kilometers on the X, 4 kilometers on the Y which would result to a 16squareKm map.