you can tweaks ue4 game with engine ini of the game found under users/username/appdata/local/gamename/saved/config/windowsnoeditor
for example for scarlet nexus
just add this to the engine.ini
[SystemSettings]
r.ScreenPercentage=150
foliage.LODDistanceScale=50
r.ViewDistanceScale=30
r.DepthOfFieldQuality=0
r.SkeletalMeshLODBias=-2
r.fog=0
r.StaticMeshLODDistanceScale=0.0000001
r.SkeletalMeshLODRadiusScale=0.25
r.LightFunctionQuality=3
r.Streaming.MipBias=-3
r.MipMapLodBias=-3
r.PostProcessAAQuality=6
r.TemporalAACurrentFrameWeight=0.125
r.TemporalAASamples=32
r.TonemapperFilm=1
r.Tonemapper.Quality=5
r.Tonemapper.Sharpen=0.85
i went overboard with some of the settings like foliage.LODDistanceScale set to 50 i dont even know if it works that high, all i know is it looks really good and i have no poping at all and no fog.