When the book preview is created, click 
in top right corner. Here you click on the 
in top right corner of the cover photo and you’ll land on the editing page. Click on 
, now you can adjust how you want the cover picture to be cropped by scroll up/down and use two fingers to zoom in and out.
Satisfied with the new cover picture? Great! Click the check mark in top right corner to save the changes.
If you have any questions, please don't hesitate to contact us!