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NOTE:
This will make Act 13 extremely dark. Revert the change before playing Act 13 by deleting the lines you've pasted in the Engine.ini file, then add them again afterwards:
[SystemSettings]
r.fog=0

To disable the white haze/fog covering everything:

- Run the game and change some settings to create the needed files then exit the game.

- Browse to C:\Users\(USER)\AppData\Local\Project_Kilo\Saved\Config\WindowsNoEditor

- Back up the Engine.ini file just in case.

- Open the Engine.ini file with Notepad then copy and paste the following two lines:
[SystemSettings]
r.fog=0

- You must leave a space between the lines you paste in and the bottom line of the [Core.System] section.

- Save and exit the file.

Comparison:
On - https://imgur.com/a/ZrLk6GN
Off - https://imgur.com/a/CFNZQo4

You will still see very small amounts of fog moving in some areas but this gets rid of most of it.

Credit goes to g_machine and Chris P. Nutts for explaining how to do this.
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