If the Desktop.ini file automatically opens when your Windows 11/10 PC starts, you can apply the fix in this post to resolve the issue.

Edit a couple lines in the ini file, and the FOV even adjusts appropriately.

Fallout 4 PC Tweaks Guide – Improve Performance, Edit Fallout4Prefs.ini and Graphics Fallout 4 PC Tweaks guide to improve PC performance and graphics by editing Fallout4Prefs.ini ...

A few graphical options aren’t available up front—they require a bit of digging and .ini file editing in order to get comfortable.