Bouncing light is not the same as reflections btw. Reflections describe things acting like a mirror, which doesn't seem to be happening here in the scene at all; what seems to be happening is the light being bounced is very strong, and very blue. Can you send in the scene? This all just looks like the material properties are wayyyyy off. (You can send it privately by starting a ticket at
https://support.chaos.com/requests/new if you want to keep the scene private and only have employees check it). Now it could be there is some massively high reflectivity AND a very high roughness which would blur the reflections and might look like this.
Directionality is less of a physical parameter really, but will do what you are looking for. Higher directionality will give sharper shadows. At 0 Directionality, the light spreads out in all directions from the source (well, up to around say 180 from the normal of the surface), and at 1 you end up with the light being focused, light rays being much closer to parallel. So if you have a square plane light, you are projecting a "square beam" the same size as the plane (just set up a simple scene with a rectangular light, a plane underneath it that the light is shining at, and adjust the Directionality, to see the result for yourself and get a feel for it). Higher directionality will take longer to render btw, and also make the light seem brighter because all the light from the source is landing in the same place rather than being spread out.
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