Hello,

The thing is that you use the default template from WooCommerce for the Checkout page, and there should be a column inside the row – https://prnt.sc/Y29aBEE7-cYM, like here – https://prnt.sc/5idxH8Ox7yf5

Please clarify, did you make changes in the Parent theme files? If not, confirm the permission to disable 3rd party plugins for testing.

Thank you for your time.

Kind Regards