The PC version of NieR: Automata suffers from a scaling problem playing in full screen, however, waiting for an official fix, the modder Kaldaien has made available a small file that solves the problems in question.
All you have to do is download the mod that you will find at this address and follow the installation instructions given below, which consist of essentially replacing the dxgi.ini file present in the game folder with the one provided by modders. The file also has other optimization settings on the technical side, including the ability to lock the frame rate so as to make the game on recent configurations not very more stable and fluid.
Overview of settings in dxgi.ini:
DisableBloatWare_NVIDIA=true ; Disables GeForce Experience / NVIDIA Shield Features, since they are broken for some people.
TargetFPS=60.0 ; Use my framerate limiter, since it performs better – SET TO 0.0 to disable
LimiterTolerance=0.05 ; Lower values increase CPU load of framerate limiter for more consistent framerates
WaitForVBLANK=true ; Framerate limiter is aligned to VBLANK (fewer dropped frames, possibly lower framerate)
BackBufferCount=1 ; Double-Buffered instead of Quad-Buffered
PreRenderLimit=3 ; Pre-Rendered Frame Limit, set lower for less input latency but possible stutter
PresentationInterval=-1 ; VSYNC (-1 = Game Preference, 0 = OFF, 1 = ON, 2+ = 1/<n> Refresh Rate
RefreshRate=60 ;FORCE 60 Hz instead of game’s default (59 / 50)
MaxRes=0x0 ; Maximum Resolution Listed in-game (0x0 = Unlimited)
MinRes=0x0 ; Minimum Resolution Listed in-game (0x0 = Unlimited)
Scaling=Unspecified ; Fix Fullscreen Scaling, don’t touch this setting
OSD can be turned off by pressing Ctrl + Shift + O, various Special K features can be configured by pressing Ctrl + Shift + Backspace