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Are the monitors arranged in a staggered manner or are they setup to be level with each other, across the top? The maximize across both screens will usually fail if the monitors are not level with each other. For example, we want to make sure they are level across the top in the display/resolution settings as shown here:
I am having the same issue. The resolution are the same on all 4 screens. I am using a port replica on my laptop to connect external screens. I have also tried plugging one monitor into laptop. The results are the same. When holding shift key and clicking full screen.