How do I show a Cart, Checkout and Order Complete progress bar on my cart page?

Turn on the stepper on Settings → Appearance → Catalog Settings, Cart Page tab:

1. Tick Enable Step.
2. Choose Steps Size (Default, Small or Smaller) and Steps Letter Case (UPPERCASE or Normal).
3. Tick Step Numbers to show numbers in the circles instead of icons.
4. Click Save Changes.

The bar shows Cart Page, Check out and Order Complete, and only appears when the cart has items. If you use Multi-step checkout, the checkout step expands to match the checkout page.