State of Decay 2: How to Turn off Film Grain, Motion Blur, Lens Flares, Depth of Field

The file you’re looking for should be at:
C:\Users\[your user name]\AppData\Local\StateOfDecay2\Saved\Config\WindowsNoEditor\Engine.ini

In that file, add these three sections:
[/script/engine.renderersettings]
[/script/engine.localplayer]
[SystemSettings]

Under [/script/engine.renderersettings], add this line:

r.DefaultFeature.LensFlare=False

Under [/script/engine.renderersettings], add this line:

r.DefaultFeature.MotionBlur=False

Under [/script/engine.renderersettings], add these lines:

r.DepthOfFieldQuality=0
r.DepthOfField.MaxSize=0

Under [/script/engine.localplayer], add this line:

AspectRatioAxisConstraint=AspectRatio_MaintainYFOV

There’s not much for FOV options, it’s either this one or the default. Personally, I prefer this one.

Under [SystemSettings], add these lines:

r.Tonemapper.GrainQuantization=0
r.Tonemapper.Quality=0

An Engine.ini file with all the above options enabled will look like this:

[Core.System]
Paths=../../../Engine/Content
Paths=%GAMEDIR%Content
Paths=../../../Engine/Plugins/TrueSkyPlugin/Content
Paths=../../../StateOfDecay2/Plugins/Wwise/Content

[WindowsApplication.Accessibility]
StickyKeysHotkey=False
ToggleKeysHotkey=False
FilterKeysHotkey=False
StickyKeysConfirmation=True
ToggleKeysConfirmation=True
FilterKeysConfirmation=True

[/script/hardwarecaps.hardwarecapsconfig]
bHasCheckedMinspec=True

[/script/engine.renderersettings]
r.DefaultFeature.LensFlare=False
r.DefaultFeature.MotionBlur=False
r.DepthOfFieldQuality=0
r.DepthOfField.MaxSize=0

[/script/engine.localplayer]
AspectRatioAxisConstraint=AspectRatio_MaintainYFOV

[SystemSettings]
r.Tonemapper.GrainQuantization=0
r.Tonemapper.Quality=0