
Jim N. answered 11/10/19
Patient, knowledgeable photography tutor
The normal export process doesn't add borders. This might happen if you're exporting from the slideshow module.
Make sure you're in the Library module (hit "g" key to get there). Do you see a border around the image there? If so, you can use the crop tool to crop the border. Then go to File: Export to export image.
Feel free to follow up if that doesn't work or if you have more questions.