Hello,
1) Appearance > Customize > Woocommerce > Product Catalog > Products per row > set 3 or 4 depend of your needs.
Appearance > Customize > Woocommerce > Product images > https://prnt.sc/n2zdvv After these changes, you need to Regenerate Thumbnails to apply them (Regenerate thumbnails plugin). Read more – https://xstore.helpscoutdocs.com/article/89-product-images
Here are screenshots of widgets from the demo – http://prntscr.com/n2zej9 http://prntscr.com/n2zen2 http://prntscr.com/n2zepk
This effect http://prntscr.com/n2zezx comes from WooCommerce Infinite Scroll and Ajax Pagination plugin, so you need to set correct settings – https://xstore.helpscoutdocs.com/article/65-woocommerce-infinite-scroll-and-ajax-pagination-settings Here is a screenshot from the demo – http://prntscr.com/n2zfkr
2) You can dismiss this notice about outdated files, it doesn’t affect the functionality of the site and will be fixed in the next update of XStore theme.
Regards