NB! It seems this console command is not compatible with CS2.
Command Profile

FOGUI

CS:GO

This command will toggle the visibility of the fog control GUI.

Syntax
fogui

Description

This command will toggle the visibility of the fog control GUI.

Syntax And Arguments

fogui

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Related Commands

fog_color

This command sets the color of fog, if enabled. The value provided should be an RGB value (separated by spaces).

fog_colorskybox

This command sets the color of the fog skybox, if fog is enabled. An RGB value separated with spaces should be provided.

fog_enable

This command enables fog if set to 1. Note that you will need to set fog_override to 1 if your map's settings disable fog.

fog_enable_water_fog

This command enables water fog if set to 1. If set to 0, water fog will be disabled. Note that you need to override your map's fog settings with fog_override 1.

fog_enableskybox

This command will enable (1, default) whether or not fog should be applied to the skybox.

fog_end

This command will set the "end" of the fog in relation to your player. Higher numbers will make the fog more distant. -1 will set to default. Fog will be shown in the distance between fog_start's value and this value.

fog_endskybox

This command will set how far you can see into the sky before fog appears.

fog_hdrcolorscale

This command sets the fog's HDR color scale. Specify a decimal value between 0 and 1.