i blundered 2 days ago and had to tweak my client.exe from the bns game folder....go to the bin folder of the version u r playing....bin64 for 64 bit.....then right click client.exe and go to properties....then do the following 2 images here............trust me......it works.....ALT+ENTER makes the game go true full screen as we usually play in a borderless window mode which is named fullscreen in settings....
tick the disable full screen optimization in the compatibility tab, and then go to change High DPI settings and untick override high dpi settings