The Cart page shows a summary of the items and quantities added to their cart, and a total of how much it will cost them. With Launch, customers can also include order notes the seller on this page.
If you're trying to customize the appearance of the Checkout page, those settings can be configured via the Theme settings tab.
Access cart page features through the theme editor
To access the settings for the cart page, go to Customize > Select the cart icon > In the left-side settings, open the Cart page section. It is worth adding a few items to the cart before making changes to the settings here, as some of the features depend on added items for their display.
Show lock icon on checkout button
Give your customers an increased sense of security by enabling Show lock icon on checkout buttons.
Enable order notes
Enabling Order notes will create a text box at the bottom of the cart page where customers can add special instructions to their order. You can modify the title and placeholder text content of this feature through the Edit languages settings.
Launch also gives you the option to include a Shipping calculator on your cart page—a tool that automatically fetches shipping rates on the cart page of your store, allowing customers to calculate these fees before completing checkout. Click Enable to activate it, then enter a Default country in the box below. Note that if a customer is logged in to their account, their default country will be selected.