I wrote a post about the differences between the Acer XF240H and the KG240 found here. I ended up keeping the XF240H because I felt that it was the better monitor based on build quality and stand adjustability. The colors on both displays will need to be adjusted as with most monitors out of the box as they are awful. The settings I ended up using should work on both the Acer XF240H and the KG240 as I believe they are both the same panel.
For whatever reason most manufacturer’s monitors out of the box are horribly calibrated including the Acer XF240H and KG240. These are the settings that I found online that I have had the most success with on my Acer XF240H.
Black Level: 3
Blue light: OFF
Super Sharpness: OFF
Colour temp: User * R Gain:55 * G Gain:52 * B Gain:50
All bias to 49
SRGB mode: OFF
6-axis hue: Default
6-axis Saturate: Adjust all to 55 except yellow saturate to 59.
Hopefully this will resolve the terrible color settings out of the box and improve your viewing experience.