I have struggling with this problem almost on all project. The shadows look awfully grainy, it is more visible on the bright textures.
Any help is greatly appreciated.

I have struggling with this problem almost on all project. The shadows look awfully grainy, it is more visible on the bright textures.
Any help is greatly appreciated.

You need to increase the Lumen samples. Read more here to get a better understanding of how Lumen works: Lumen Global Illumination and Reflections in Unreal Engine | Unreal Engine 5.0 Documentation