The game give you a bar to slide from 25%-200% however it can actually only support 25/50/100/150/200. For example when you choose from 50-100 it will be automaticly set to 50. only set to 100 would work. Same goes with 100-200. Adding a 75 or 60/7080/90 option would be better because I could't play well on 1440p but scale it down to 50% will make the game looks too blurred.
Btw, the resolution of medium textrue is also too low especially the soldier's model. Check the hand and weapon in the pic I post. The diference between medium and high texture is soooooo huge!!!
High looks quite nice however mediumturns everything in to a group of mud.