In case you had issues with the image size right inside the quick view, we suggest you regenerate all thumbnails of the products of your shop.
For the product images, you can set the width and height through the dedicated options.
With regard to thumbnails, the plugin’s default behavior implies that all product thumbnails show in a classic mode, as provided by WooCommerce. However, you can choose to show them with the “Slider” mode or completely hide them.