You can scale the number of samples used for reflections of clouds and for the shadowed Unreal Engine 5 includes an extensive and constantly expanding built-in modeling toolset, including mesh editing, geometry scripting, UV creation and editing, and baking and mesh attributes.
It is the file you will open in the Modeler to make changes. To learn more … Unreal Engine 4 - Making a 2D Platformer in UE4 - Full Length.