To edit your Images settings you'll have to navigate to the settings.
Click on the 'Theme settings' in the left sidebar, its indicated with the following icon:
When clicked, on the right sidebar your theme settings will open:
Now click on 'Images', the following settings will open:
Set the aspect ratio of your images, you can choose between: Square, landscape and portrait.
Check the box if you want the images to stretch/zoom in to fit your image ratio setting.
Apply this effect on your product or collection images, it will hide the white background. Recommended when using a colored general background and images with a white background.
Pass through color on product images:
Check the box to remove the white background from your product images.
This only works with images that have a white background!
Pass through colors on collection images:
Select which pass through option you want to use on the collection pages. You can choose between: Disable pass through, Enable pass through, Enable pass through with a light background.
Show all images with rounded corners:
Enable this setting to show every image within the theme with rounded corners.
Clickable images: Enable this to make images clickable instead of only a clickable link, for example in a banner.