Hello,
1) If you want to update bundled plugins you can do this from XStore > Plugin Installer > hover over the plugins with the update and click the Update button http://prntscr.com/uh4ts6
2) What page builder do you use Elementor or WPBakery?
3) WooCommerce PDF Invoice plugin settings you can find in WooCommerce > WooCommerce PDF Invoice http://prntscr.com/uh4sy6 Here you can find plugin docs https://support.rightpress.net/hc/en-us/categories/200072368-WooCommerce-PDF-Invoice
Regards