For themes that allow you to show your cart as a page or a drawer, you can customize this by following these steps:
1. Click on "Themes" on your Shopify dashboard and select "Customize theme".
2. Select "Cart" from the list of options on the left sidebar.
3. If your cart is not Ajax, there will be nothing to change. If it is, you will see a dropdown allowing you to select the type of cart you want to display. Select "Page" from this dropdown in that case.