With my personal experience there’s no way to completely remove such, however, you can try playing with the Ambience and Outdoor Ambience in Lighting by making it a lighter grey tone which should reduce that sharp white light effect on the edges. You can also reduce the brightness or change the time of day.
Ok so, best way to do this changing the direction of light in the Light settings in studio, and also can change into shadow map for a more realistic feel to the place.
Did you union the roof? Unions usually glitch light like that, try surface lights on the roof if you want a quick fix and or change the ambient lighting to not black but a more grey or a color.
No it’s not a union, this is a common bug with lighting due to lighting being voxel. In areas with thin walls and ceiling, the voxel lighting will assume it’s just empty space and let some light through.