You need to find config. ini file in your Black Ops 3 directory and then copy the config file from here and save the changes.
//
//Gameplay
//
//Frame rate cap (0 for none)
MaxFPS = "60" // 0 to 1000
//Show current framerate on screen
DrawFPS = "0" // 0 or 1
//Toggle framerate smoothing
SmoothFramerate = "0" // 0 or 1
//Horizontal field of view in degrees assuming 16:9 aspect ratio
FOV = "80" // 65 to 120
SplitscreenOrientation = "0" // 0 or 1
//Enable network voice chat
VoiceChat = "1" // 0 or 1
//Enable occlusion of sound behind solid surfaces
SoundOcclusion = "1" // 0 or 1
//Mouse smoothing amount
MouseFilter = "0" // 0 to 10
MouseAcceleration = "0.4" // 0 to 1
MouseSensitivity = "11.96" // 0.1 to 30
//Mouse vertical sensitivity
MouseVerticalSensitivity = "0.022" // -1 to 1
//Enable vertical look with the mouse
MouseVerticalLook = "1" // 0 or 1
//Maximum number of simultaneous human corpses
CorpseCount = "32" // 1 to 32
//Number of frames the driver is allowed to enqueue, a lower value improves input latency but may decrease performance. Set it to 0 to use the system default, usually 3.
MaxFrameLatency = "0" // 0 to 4
//
//Setup
//
//Set to zero to force auto-detect to run at startup
AutoDetectHasRun = "1" // 0 or 1
//Thread count for handling the job queue
WorkerThreads = "2" // 2 to 4
//Clear to check driver against recommended
LastDriverNvidia = "38813" // 0 or bigger
//Clear to check driver against recommended
LastDriverAMD = "0" // 0 or bigger
//Fraction of video memory usage to target
VideoMemory = "0.95" // 0.75 to 1
//
//Display
//
// 0 - Windowed, 1 - Fullscreen, 2 - Fullscreen Window
FullScreenMode = "2" // 0 to 2
//Window X position
WindowX = "0" // -8192 to 8192
//Window Y position
WindowY = "0" // -8192 to 8192
WindowSize = "1366x768" // any text
RefreshRate = "60" // 1 to 240
//Monitor index to use for fullscreen
Monitor = "1" // 0 to 8
//Vsync only applies in fullscreen
Vsync = "0" // 0 or 1
//Percentage of window resolution that the 3D scene renders at
ResolutionPercent = "100" // 50 to 200
//Color spaces for monitor output
DisplayGamma = "sRGB" // sRGB, rec.709, or rec.709 - Limited
//Set to 3 to enable triple buffering, useful to prevent large framerate drops when vsync is enabled
BackbufferCount = "2" // 2 to 3
//
//Graphics
//
//LOD's to drop on models, lower numbers are higher quality
MeshQuality = "1" // 0 to 8
//0 - Force 2x anisotropic filtering, 1 - Per material, 2 - Force 16x anisotropic filtering
TextureFilter = "0" // 0 to 2
//Number of mips to drop on streamed textures, lower numbers are higher quality
TextureQuality = "3" // 0 to 3
//Number of mips to drop on effects and dynamic decals, lower numbers are higher quality
TextureQualityFX = "3" // 0 to 15
//Number of mips to drop on reflections, lower numbers are higher quality
TextureQualityProbes = "1" // 0 to 16
//Number of mips to drop on sun shadows, lower numbers are higher quality
TextureQualityBakedSunShadows = "1" // 0 to 2
//Force lowest mips to stay loaded instead of streaming
TextureLowDetailResident = "0" // 0 or 1
DisableDynamicLightShadows = "1" // 0 or 1
DisableDynamicSunShadows = "1" // 0 or 1
//Resolution of spot light shadows
SpotShadowTextureSize = "1024" // 128 to 8192
//Resolution of omni (point) light shadows
OmniShadowTextureSize = "256" // 128 to 2048
//Enable multi-sampled soft shadows
ShadowFiltering = "1" // 0 or 1
//Number of lights with otherwise static shadows to force characters shadows on
ActorShadows = "0" // 0 to 16
//Enable volumetric sun and light shafts
VolumetricLightingEnabled = "1" // 0 or 1
//Number of raymarch samples for sunlight
VolumetricLightingMaxSunSamples = "8" // 1 to 256
//Number of raymarch samples for local lights
VolumetricLightingMaxLightSamples = "40" // 1 to 256
//Skip every other sample if color is constant
VolumetricLightingSkipSunSamples = "1" // 0 or 1
//Skip every other sample if color is constant
VolumetricLightingSkipLightSamples = "1" // 0 or 1
//Enabled order-independent transparency
OIT = "1" // 0 or 1
//Maximum number of overlapping transparency layers
OITLayers = "8" // 8, 9, 12, or 16
//Screen-space ambient occlusion method
SSAOTechnique = "GTAO Medium Quality" // Disabled, HEMIAO, GTAO Low Quality, GTAO Medium Quality, GTAO High Quality, or GTAO Ultra Quality
//Anti-aliasing technique
AATechnique = "Filmic SMAA T2x" // None, FXAA, SMAA 1x, Filmic SMAA 1x, SMAA T2x, or Filmic SMAA T2x
//Per-object motion blur
MotionBlur = "Auto" // Off, Auto, or On
MotionBlurQuality = "Medium" // Low, Medium, or High
//Better lighting for skin
SubsurfaceScattering = "0" // 0 or 1
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