How Can I Show the Original Aspect Ratio?

Using the Masonry Layout (version 3.0 of the pro version and above)

As of version 3.0 of the “Pro” plugin you can display images in their original aspect ratio using the masonry layout. Posts will be displayed in columns with no whitespace between them. Enable this in the Layout area of the Customize tab on the settings page or add this to your shortcode [instagram-feed layout=masonry]

Using CSS

If you have images that need to be displayed in their original aspect ratios, you can add the following to the plugin’s Custom CSS section (Instagram Feed > Customize > Misc):

#sb_instagram .sbi_photo {
    height: auto !important;
    background: none !important;
}
#sb_instagram .sbi_photo img {
    display: block !important;
}