Compared to the existing solutions from WSGF made to remove the black bars appearing in the game at 21:9 and wider resolutions, this tool perfectly matches the vertical field of view of each scene to that of 16:9, also allowing to see and adjust the current FOV in real time.
Download the archive and unpack it using the password pcgw Launch the game, followed by the tool. Apply the fix before the main menu appears or at the main menu before loading into a game. All trainers containing CE components may trigger some anti-virus software.
Inspired in part by killer-m's work.
Tested the latest Steam version at 2560x1080, 3840x1080 and 5760x1080.

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The small patcher allows any resolution to be selected in the game.
Unpack the archive and follow the instructions of the tool.

Tested the latest Steam version briefly at 2560x1080.

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The small patcher and trainer for Dungeons & Dragons: Dark Alliance remove black bars appearing in the game at 21:9 and wider resolutions.

For the Microsoft Store version,
Download and unpack the applicable archive using the password pcgw Launch the game, followed by the tool. Press the button as shown to toggle the black bars off and on. For Steam,
Unpack the Shipping exe found in /CotH/Binaries/Win64/ with Steamless (like this). Download the applicable archive from here and patch the unpacked file renamed to match the original. Simply patching should work for any other versions.

Tested the latest Game Pass version at 2560x1080 and briefly at 5760x1080.

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The small patcher for Tom Clancy's Ghost Recon Breakpoint removes black bars appearing in the game at 21:9 and wider resolutions.
Disable BattleEye. Download and unpack the archive included here. Use the patcher to modify GRB.exe and/or GRB_vulkan.exe depending on the preferred graphics API mode - DirectX vs Vulkan. Be mindful of the backup files taking up as much space as the original executables. They can be safely removed, but then the game files will need to be verified if the goal is to revert or to play PvP.
Tested the latest Ubisoft Connect version at 2560x1080. Additionally verified as working by a WSGF user.

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You need to have Cheat Engine installed, then launch the game, open the table, attach it to the process and use the hotkeys:
 
F4 - activate the mod
F5 - reset FoV to default
F6 - Increase FoV
F7 - Decrease FoV
F8 - Set FoV to default +30°
 
Quick video to show the mod in action: https://streamable.com/2iosxc
 
Known issues:
If you set an offset too high or too low the camera will flip upside down, just press F5 to reset it.
In-engine cutscenes are also affected, things that weren't supposed to be in the shot may behave oddly.
Vehicle weapon crosshairs may be off-center (higher) when using higher FoV, just aim a bit higher than the actual target.