Assassin's Creed IV: Black Flag doesn't support ultrawide natively and is locked to 60 frames per second, but ultrawide can easily be fixed by running a third-party application called Flawless Widescreen. The fix does stretch the HUD elements and throws off the 3D waypoints in single-player, so beware of that and in order to get an accurate reading of your waypoints you need to check your minimap while running around instead.

The application can be downloaded from their official website here:
bit.ly/2tvgTuT (Flawless Widescreen)

Run the game then Flawless Widescreen, it should pick up the game's process and inject the fix with a slight delay.

I covered both singleplayer and multiplayer in this video.
Multiplayer starts at 06:23

💬 Discord: discord.gg/8jmTTyP


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PC Specs:

🔷Core i9 9900KS @ Stock
🔷Asus ROG Strix 1080ti
🔷G.Skill Trident Z 2x8 @ 3600Mhz
🔷Samsung Evo Plus M.2 SSD 1TB
🔷Asus Maximus Hero X

Monitor is a Samsung CRG9 which is a 120hz 5120x1440 G-Sync Compatible ( Freesync 2 ) monitor with HDR support (1000