Here are the instructions to edit the files with out interrupting any changes that you made to Skyrim.ini and Skyrimprefs.ini
1. Make sure to launch your game first, if you haven't played the game already, this just makes the files so you can edit them.
2. Go to your documents folder, my games, Skyrim Special Edition
then open the files you need to edit, this is on your (C) drive.
3. Open both Skyrim.ini and Skyrimprefs.ini
4. Under [Display] In Skyrim.ini put the, fDefaultWorldFOV=100,
fDefault1stPersonFOV=100,
Then changing the 100 to your liking.
5. Under [General] in Skyrimprefs.ini put the, fDefaultFOV=100
and then changing the 100 to your liking.
6. Lunch the game load the game in to a save or new game, open
console command its the ` key its below the ESC button.
7. Type setcamerafov or fov, then the number, eg: setcamerafov 100, then hit enter, this
just tells the game to remember the lines you have edited.
(make sure it's the same number that you are typing into
console command and the file you edited.)
8. Save your game and reload the save game.