credit u/Ferosnow95 on r/ultrawidemasterrace

32:9 fix:

  1. Download a hex editor (I used imhex)
  2. Open it and Starfield.exe (drag and drop in imhex)
  3. Ctrl + F -> 8E E3 18 40
  4. replace with 39 8E 63 40
  5. Save

FOV fix:
create a "StarfieldCustom.ini" in "Documents\My Games\Starfield" with the following:
[Camera]
fFPWorldFOV=120
fTPWorldFOV=120