For me the fog stays and does not go away and I cant see nothing. Another problem I face is it'll stay at 57% when loading and not load, I've reinstalled the game had no mods loaded and reinstalled the map fully and the same problem occurs.
If you would like to remove fog, go into console commands and
setGroundFogMaxHeight 0
setGroundFogGroundLevelDensity 0
setHeightFogGroundLevelDensity 0
