We have a sub-level that holds all the static mesh actors that are used for terrain baking. We would like to have this level not load in editor unless the artist manually request it to save on loading time for people that do not work on the terrain. As far as I understand the streaming method only impacts in game behaviour the editor always force loads all levels referenced in the persistent level. So my question would be can we get this behaviour without using world partitioning? I did a small POC on my side but ir required some engine modifications.