Hello,

You can find the Settings for the checkout fields under Appearance >> Customize >> Woocommerce >> Checkout.

Screenshot for Clarification: https://gyazo.com/52f42bc35e116a488320b85a2650dbb5

Please read the following article for help because the emails are controlled by woocommerce and our theme doesn’t influence:
https://www.mailpoet.com/blog/woocommerce-email-not-sending/#:~:text=It’s%20possible%20that%20you’ve,ticked%20before%20you%20save%20changes.

Regards.
Xtemos Studios.