I have a U2515H Monitor and Horizontal position of Display is Slight Off (i.e needs to be move to the left) on my screen. Manual says to use Monitor Onscreen Display (OSD) to adjust position. Sorry but I can find no controls to do this.
The U2515H User's Guide must be incorrect in stating: Geometric Distortion--> Screen not centered correctly--> Adjust horizontal & vertical controls via OSD
There is no such setting in the OSD based on the pictures in the User's Guide. All you can do is open the OSD- Others and Factory Reset it. Then make sure that the Aspect Ratio is set to 16:9 and the resolution is set to 2560x1440 60Hz.
Then look to the GPU driver control panel to see if there are any options for horizontal control.