Download the latest [release](https://github.com/rebtd7/FF13Fix/releases) and add both ```dinput8.dll``` and ```FF13Fix.ini``` to the folder ```FINAL FANTASY XIII\white_data\prog\win\bin```.
You may want to change ```FF13Fix.ini``` if you want to cap the frame rate.
The game calls [SetScissorRect](https://docs.microsoft.com/en-us/windows/win32/api/d3d9helper/nf-d3d9helper-idirect3ddevice9-setscissorrect) using a rectangle hardcoded with the 720p coordenates. This correct the coordenates and rectangle size in order to fix it.
I did not see any negatives on unlocking the frame rate, but your mileage may very. If you are having issues, edit ```FF13Fix.ini``` to cap the frame rate.