Most of the thumbnails settings you can change can be found on the Options step, the Thumbnails tab. Please click on the topic below for more information on it.
How to change the thumbnail image size
How to add a border to the thumbnail images
How to add shadow effect to thumbnail images
How to set custom thumbnail size and link address
How to add EXIF or image file information to the thumbnails title
How to link thumbnails directly to images
Thumbnail resize methods explained
Thumbnail image file name
How to change the thumbnail image format settings
If you have a question that is not covered in the above topics, please do not hesitate to ask our support team at email@example.com.