Why does the editor say lighting needs to be rebuilt?
Article written by Natalia C.
Anytime you add/move a static light actor or geometry it casts light onto a level, lighting will need to be rebuilt and the LIGHTING …
https://dev.epicgames.com/community/learning/knowledge-base/2mGM/unreal-engine-why-does-my-editor-keep-saying-lighting-needs-to-be-rebuilt