My iMac is detecting wrong display size
Just received a 21.5 inch iMac running El Capitan. I connected my AOC 21.5 inch external monitor and the display is way to blurry and large. I look directly to change the resolution and even after the (Option) + scaled radial trick that allows one to see more resolutions, when i pick the one that my display is natively (1920 x 1080) there's about 15% of my screen that is still black.
When I check the display tab in "about my mac" it shows the monitor as being 13.9 inches which it definitely is not. Please Help me 😟
iMac, OS X El Capitan (10.11.1)