How to Adjust the display zone of your photo?

As illustrated in the above image, you can apply a transformation to the selected border in the left window. Drag the handles to make the desired change and view the results in the right window. The result preview may be blurred. Don't worry, for the final result in your effect will seldom be blurred. If you are satisfied with the selected zone, press Button "Go! view the result" to have a look at your final effect.