Windows screen is not properly filling my monitor

[Windows 10]

My windows screen is not properly filling my monitor, so that the top and left sides of the screen have black bars, and the bottom and right side of the screen are cut off. I have tried changing resolutions, and everything in the Display section of windows settings.The image posted is an example of what it looks like for me, with the black section representing the unused monitor section.If anybody knows anything that could help, that would be awesome!

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