You can modify the visibility settings to your own liking in the source code, and apply them to the mod by recompiling. (Only if you know what you are doing!)

(Credits go to g10stpd, the maker of FogOut) This "optional" add-on is to be used as a replacement to the old FogOut, and if you use Darker Nights then the patch included on that mod page still works. This modified add-on only gets rid of the "exterior" weather fog on clear days and nights. It no longer modifies interior cell fog, as that is now Dynamic Interior Fog Removal's job. Note: Do "NOT" use this add-on with weather overhaul mods such as Vivid Weathers, only use this with vanilla weathers like it was intended in order to avoid conflicts. You can always use FO4Edit to compare and see if something is conflicting, although I would recommend that you use a nice weather overhaul mod over FogOut, such as Vivid Weathers.

This mod adds a settings holotape to the player's inventory under the misc. tab. The holotape has three interior fog visibility settings for you to set (Invisible, Subtle and Vanilla), and it has an uninstall menu.

You can modify the visibility settings to your own liking in the source code, and apply them to the mod by recompiling. (Only if you know what you are doing!)