AppData\Local\VisionsofMana\Saved\Config\WindowsNoEditor
engine.ini

This will remove TAA (recommended at 1440p or higher) Motionblur, Chromatic, and Depth of field
overall giving the game a more sharp image quality
[SystemSettings]
r.PostProcessAAQuality=0
r.DepthOfFieldQuality=0
r.DepthOfField=0
r.MotionBlur.Max=0
r.MotionBlurQuality=0
r.SceneColorFringeQuality=0
r.Tonemapper.GrainQuantization=0
r.Tonemapper.Quality=0
r.BloomQuality=1 (I just dont like heavy bloom)

Other things that could work but probably need a beef machine This will work for draw distances and better shadows you can actually even set them to 0 for better steamdeck performance if you wanna 40 FPS instead of 30.
r.ViewDistanceScale=5
r.LandscapeLODBias=-3
r.SkeletalMeshLODBias=-2
r.StaticMeshLODDistanceScale=0.25
r.Shadow.MaxResolution=8192
r.Shadow.CSM.MaxCascades=16
r.Shadow.TexelsPerPixel=10
r.Shadow.RadiusThreshold=0.0075
r.Shadow.DistanceScale=2
r.MaxAnisotropy=16
r.MipMapLODBias=-3
r.DetailMode=2


I will say be careful lowering some stuff on the steamdeck may pop up with a FATAL ERROR crash
as some cutscenes are not designed to handle no shadows no AO etc. best thing to do is move the engine.ini, get past the cutscene and then replace it back into the folder.