There are now multiple settings available in the game's Video Options that should render the rest of this guide moot for most use cases:

• Maintain Y-Axis FOV Aspect Ratio - will use only the height of your monitor for FOV calculations
  
• First Person FOV Modifier - Allows you to adjust the scale of your character's hands/tools/etc. Basically everything in the foreground that you couldn't adjust before.

For a 21:9 aspect ratio my preference is FOV=80, Maintain Y-Axis FOV Aspect Ratio=ON, First Person FOV Modifier=1.3

Before you get all your hopes up, this guide isn't some huge fix. Coming out of this guide, you'll either have edited a single line in a config file, or maybe just tweaked the FOV slider in-game, but you feel better inside.

The field of view in Satisfactory doesn't seem to be directly tied to vertical or horizontal. From my testing, I've found that at a 21:9 aspect ratio with an FOV of 120 degrees (which I find reasonable for 21:9), the world looks the same as at a 16:9 aspect ratio with the FOV at 104 degrees, minus having the left and right sides cut off in the 16:9 image. This ratio (and the others given below) seems to indicate Satisfactory doesn't directly relate the FOV to aspect ratio in any specific manner, as it's consistently ~16-18 degrees different between a 16:9 and a 21:9 display, regardless if the target FOV is large or small.

Of course, you may have noticed I specifically said the world. Unfortunately, your avatar that occupies the foreground of the screen doesn't seem to care what the FOV slider is set at, only what the aspect ratio is. You'll have to decide if the avatar bothers you more than having vertical bars. You can see what I mean below (all aspect ratios were tuned to have the same vertical FOV). Note how the taller the aspect ratio is, the more of your avatar's hands are visible.

Nothing below the top of the hand's knuckles is visible onscreen.


Up to the bottom of the thumb is visible.


A portion of the arm is visible.


With my 3440x1440 ultrawide monitor, I did some testing to correlate 16:9 FOVs with 21:9 FOVs; this was done by placing the top edge of an object onscreen at the very top of the screen, then changing the resolution to 2560x1440 and adjusting the FOV to get the same edge to the very top of the screen again. With the initial test, I also checked an object at the bottom edge to verify.
There's are other options, if you find that even the maximum FOV of 120 isn't enough for your ultrawide (particularly useful on a 32:9). The FOV can be adjusted beyond the slider's limits from within the game config file or (props to Whisker :> for pointing this out) through the in-game developer console. It may look pretty distorted on a 16:9 monitor, but Satisfactory will run at an FOV of 160 if you tell it to. There is a limit - at an FOV of exactly 180 you'll just see a void, and above 180 things become inverted.

From my testing, it doesn't appear that FOVs set by the developer console are saved to the config file, so if you go this route, your best bet is to find an FOV that you like using the console, then edit to config file so you don't have to set it every time you launch Satisfactory.

First, you'll need to enable the console by pressing CTRL + SHIFT + L at the same time. Once you enable the console, you can open it by pressing the tilde ( ` / ~ ) key. The FOV is then set using the command
where # is your desired FOV. As I've stated previously, this method doesn't appear to be permanent and your set FOV will be lost when Satisfactory is closed.

Open the config file located at and change the entry to your desired FOV (# will be a number).