You’re welcome!
4. Please see screenshots http://prntscr.com/iqjh21 http://prntscr.com/iqjkfz
now http://prntscr.com/iqjklq
read more https://xstore.helpscoutdocs.com/article/65-woocommerce-infinite-scroll-and-ajax-pagination-settings
6. Sorry, but your question is a bit unclear. Please explain it in more details.
Regards