Hello, @Fenyxweb,
The thumbnail cropping section in the customizer allows store owners to select one of three cropping ratio settings for images in the catalog:
1:1 (Square scropping)
Custom (Store owner can enter a custom aspect ratio)
Uncropped (Preserve single image aspect ratio)
The actual image dimensions are then calculated based on the cropping option selected and the image width. There is no option to change/set the height of the image separately, however, you can choose the Custom option and set the ratio as per your requirements.
For more information, please refer to the official documentation of WooCommerce here: https://woocommerce.com/document/image-sizes-theme-developers/.
Best Regards,
8Theme’s Team