Bump up their resolution in project settings.
Also, you may want to take the rendering course from the Learn tab or something similar.
They cover almost all the basics like this.
And remember that the engine genuinely su cks at Reflections and rendering with performance as a whole.
It can look good, but only at very low FPS unless you are using a 3090 or something equal in computational power.
Ray tracing, even if you can’t use it, is also equally bad. Unfixed and mostly just ignored by the unreal team. To the point you are much, much better off using the RTX branches from nvidia.