Hello,
Use the following code to hide loader (Theme Options > Custom CSS)
#mst-wcqvfepb-popup-modal .thumbnails-list.thumbnails {
display: none;
}
We don’t display the product gallery in the quick view by default. You can only enable/disable images slider for the main image in the ThemeOptions > WooCommerce > Shop Elements > Quick View > Product Images http://prntscr.com/tpr356
Besides you use custom Quick View option. So, if you want to show the product gallery slider in addition to the main slider in the Quick View it required additional customization.
You can submit customization request here because our basic support does not include this, unfortunately.
Regards