Hi zamankhan
I am Dave, an Independent Advisor, I will help you with this . . .
That monitor has a native resolution of 1920 x 1080 at 75 Hz and so, should be full screen at that resolution . . .
If your screen is not full screen, do you have a black border on the sides of your screen?
If so, on that monitor there should be a menu button, press that and look for an autofit or Aspect ration setting and see if that will be full screen at 1920 x 1080
If not, right click your Desktop and open the video card control panel and in there, look for the Aspect Ratio setting, then try each option on that settings page . . .