Installation
1. Put the files inside "Starfield Directory" in Starfield's main game directory, where Starfield.exe is
2. Put the files inside "Documents" in your documents folder, where StarfieldPrefs.ini is

StarfieldCustom.ini Location

%USERPROFILE%\Documents\My Games\Starfield
C:/users/%USERNAME%/Documents/MyGames/Starfield
C:/users/%USERNAME%/OneDrive/Documents/MyGames/Starfield
/home/deck/.local/share/Steam/steamapps/compatdata/1716740/pfx/drive_c/users/steamuser/Documents/My Games/Starfield

Starfield Directory Location

C:\Program Files (x86)\Steam\steamapps\common\Starfield
/home/deck/.local/share/Steam/steamapps/common/Starfield

Disclaimer: "Ultra Performance" disables shadows, which can cause interiors of buildings to be very bright. This is a bethesda issue not a mod issue