Thats because the game fov is Vertical Minus instead Horizontal Positive
The further from 4:3 you are (wide) the more it cut from the top and bottom of the render area.
If it was coded in Horizontal+ it would add rendering elements to the side letting you see more when you go wider resolutions like 16:9/21:9 and higher
Setting a vieport is nice because at least you can still use chat and other windows like bags in the black area.
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