The Problem:
I uploaded images to the gallery, but they are completely pixelette. Only when I click on the image do I see a big image. How do I solve this?
The Solution:
What you need to do is set the thunmbnail size to the relevant size in Settings > Media
You can use the following plugin to re-adjust the images:
You can read more regarding the proccess in the following guide: https://support.pojo.me/docs/setting-thumbnails-in-wordpress-and-woocommerce/