Field of View (FOV) is such an important visual option in most games, but unfortunately, sometimes developers get so busy that it falls out of the checklist for launch. Starfield is one of those games that doesn't feature an FOV slider at launch, and we don't really know if Bethesda has any plans to add it anytime in the future, but we do have a fix for it!
Starfield: How To Change Field Of View (FOV)
A bit of extra work on the user's side.