3 monitors connected, but 2 are active, the 3rd monitor is forced inactive

[Roger Williams2]

When I try to use 3 monitors, 2 are active and the third monitor is forced inactive, I've already tried updating the graphics driver, reducing the active display's resolution, using Win+P to set it to extend, and none of these worked.One thing I will NOT do is update the bios, it is too risky and my type of OptiPlex has no bios recovery feature.When I try to set the display to extend directly from Start->Settings->System->Display, I get the error "The display settings could not be saved. Please try a different combination of these settings."I have a Linux partition on my C Drive that

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