Lifter LMS Product Image Settings

You can customize the product image by heading towards:
Dashboard >> Appearance >> Customizer >> WooCommerce >> Product Image 

You will find the following options:

After publishing your changes, new image sizes will be generated automatically.

Main image width – Image size used for the main image on single product pages. These images will remain uncropped.

Thumbnail width – Image size used for products in the catalog.

Thumbnail cropping – Will have the following three options:
1:1 – Images will be cropped into a square
Custom – Images will be cropped to a custom aspect ratio
Uncropped – Images will display using the aspect ratio in which they were uploaded