In this documentation, you'll learn how to edit the 'Your Products' title.
Here's what we are going to edit:

Follow along:
Step 1: Go to the 'Fields' tab in Checkout
Click the pencil icon on the 'Your Products' section.

When you do so, a popup shows.
Step 2: Edit the 'Your Products' title

Once done, hit the 'Update' button.
When you're done, save the changes to your checkout form.
Here's the final output:

This is how you can edit the 'Your Products' title on your Checkout page.