Hello,
If you are creating the Custom Layout for the Checkout page on your Site and seeing those Widgets in that then the thing is these are default features that come from WooCommerce end and aren’t editable.
Notice Wrapper shows success and error notices according to the submission on the Checkout page.
The Login option appears on the Checkout page by enabling the option under the Dashboard > WooCommerce > Settings > Accounts & Privacy tab > in that uncheck “Allow customers to place orders without an account” and check “Allow customers to create an account during checkout“. This is how you will get that option to work.
Best Regards.