Bethesda's games are notorious for not having any built-in FOV sliders in their settings menus and sadly, this is still the case with the launch version of Starfield. Players are unable to change this setting in-game simply because the option to do so doesn't exist.
Starfield: How to Change FOV (PC)
Though Starfield might not have an FOV slider, changing this setting isn't completely out of the question as far as PC players are concerned.
