Same issue on external monitor (1920x1200 16:10) and laptop monitor (1366x768 16:9). Laptop show fullscreen, external monitor has black frame around a mirrored image from the laptop.
Same issue on external monitor (1920x1200 16:10) and laptop monitor (1366x768 16:9). Laptop show fullscreen, external monitor has black frame around a mirrored image from the laptop.