In this video, I show you how to convert an Unreal Engine 5 scene that uses baked lighting into a fully dynamic Lumen scene. We’ll go through every setting you need to change, from project settings to lights and post-process, so you can get real-time global illumination and reflections without rebuilding lightmaps.
https://dev.epicgames.com/community/learning/tutorials/KJE11/unreal-engine-from-baked-lighting-to-lumen-in-ue5-all-the-settings-you-need