Hi,
How can I set the phone field in the shipping and billing form as required? At the moment, it is set as optional, and I don’t know where to change it.
Set the checkout with the theme’s template, which means, remove the “Checkout” element in the Gutenberg and define the [woocommerce_checkout] shorcode to show the check page, then recheck the issue.
As for the validation, this field comes from WooComemerce and our theme cannot influence it.