Hello,
Thanks for using our theme.
1/ Activate WooCommerce Infinite Scroll and Ajax Pagination settings plugin and follow this article – https://xstore.helpscoutdocs.com/article/65-woocommerce-infinite-scroll-and-ajax-pagination-settings
2/ Theme Options > WooCommerce > Shop > Products style > enable “Hover buttons on mobile”
3/ Theme Options > Header builder > Mobile menu > Off-Canvas Content > Content Size (%)
4/ There is no such possibility when “Add To Cart With Quantity” option is enabled.
Regards