Here’s how to create a custom cart page:
1. Go to WordPress Dashboard.

2. Select ProductX, then Go to WooCommerce Builder.

3. Select Add Cart. Select Start from scratch (if you want to make it from scratch) or Import a template (if you want a premade template).

4. Click the icon (toggle block inserter), and then add the desired Blocks to complete your cart page. Now hit Publish.

And you have successfully created your custom cart page.