This happens when the game fails to properly detect your native resolution. You can set your native resolution (if you're not sure what it is, you may try to se the highest available) by entering SETTINGS, enabling "Custom settings" and then selecting the appropriate resolution at "Display settings" ( button with monitor image). Then click "Confirm".
You will be asked to confirm the new resolution. If something goes wrong and you see black / corrupted screen, please wait 15 seconds. After that the resolution will be reset to the last working state and you will be able to pick another one.
Please make sure that Refresh Rate value (Settings) is set to high enough value. Higher refresh rate values are easier on your eyes.
Resolutions that have screen width over 2000 may have problems with proper detection of aspect ratio - we are aware of this issue. You may want to change it manually.
Note: If you have any problem with the game, please check if your video card drivers are up-to-date. The lastest drivers can be found at www.nvidia.com andwww.amd.com.