Settings games to 1440p would be pointless, as your monitor only supports 1080p (1920x1080) not 1440p (2560x1440), so setting your games to anything above 1080p will cause cropping and you only seeing (Logically, 1/2 of your game, or with 4K only 1/4 of your game).
To run 1440p, you would need to get a 2560x1440 Monitor, as this would support that resolution and be able to run games at that, rather than cropping.