In this documentation, you'll learn how to change the SEO title of a Checkout page.
Here's what we're talking about:
Step 1: Go to the 'Design' tab in Checkout
Click on 'Edit' to edit the template using the built-in Customizer.
Step 2: Click on the Header widget
From the side panel, choose the header widget. There you'll see the option of changing the Page SEO Title:
Set the title as per your requirements.
Step 3: Hit the 'Publish' button
This will save your changes made to the Page SEO Title.