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Without further information from you, the general assumption would be that you don't understand aspect ratios.
As an example, current TV screens have an aspect ratio of 16:9 (1.78:1), while old TVs had 4:3 (1.33:1). Thus, if you're watching an old TV production on a modern TV, you'll be getting black bars on the left and right, because the old image isn't wide enough to full fill up the screen.
In a similar fashion, if you're watching a movie, you'll be getting bars at the top and bottom -- because movies are often produced in an aspect ratio of around 2.35:1 -- so your TV screen isn't wide enough -- or, looking at it differently, you're TV screen is too high.
The same applies to games. In theory, the game could adjust to whatever the aspect ratio of your monitor is (16:9 being the most common one as well), but not every game does. Old games might simply be hard-coded to 4:3, while newer games might be hard-coded to 16:9. This is also because different aspect ratios also mean that players standing in the same location looking into the same direction will see different stuff based on their aspect ratio (more/less stuff to the sides or top/bottom), while a fixed aspect ratio eliminates that difference.
In general, you should be running the native resolution of your monitor. If your monitor is not 16:9 and the game doesn't even offer its native resolution, you're out of luck. If the game does offer the native resolution and still gives you black bars, it's the same: the game runs at 16:9, and it's not going to change its mind just because your monitor is different.
I'm guessing you don't, because if that was set at your aspect ratio and resolution, it would say "native" and there would be no black bars.
There's your issue then, GPU scaling. The game and the scaling is not set up right to work with each other. Besides, why have scaling on? Surely you don't need it for this game? Isn't that best used for games that don't give aspect ratio and resolution options?
The only other thing I can suggest then is to verify your files, but you don't own it on steam, I'm assuming ubisoft or Epic? I'm not completely sure on how those platforms work.