External display resolution – cursor gets lost

displayresolution

I connected my new K272HUL display to my Macbook Pro Retina 15". The issue is that the resolution that the monitor displays seems to be too large (2560×1440) and my mouse gets lost in the display. My menu bar is completely hidden and I can only see a little bit of it if I hover over it.

Any clue on how I could fix this?

Thanks!