Thank you for your response. Unfortunately I am working at a localhost server (MAMP). When I change the thumbnail width in the WordPress Customizer and check hard crop (1:1) the preview of the product catalog is correct (square images). But when I update the setting and check the frontend, nothing changes. When I inspect the code, I see that the original image sizes are loaded and not the defined thumbnail size of the image (square). Regenerating thumbnails isn’t a solution either.
