How do I connect Workbench to my playground instead of my work production org?

I want to get credit for Use REST API challenge: https://trailhead.salesforce.com/content/learn/modules/api_basics/api_basics_rest

The steps listed are:

1. Log in to your Trailhead Playground and navigate to Workbench.
2. For Environment, select Production.
3. For API Version, select the highest available number.
4. Make sure that you select I agree to the terms of service.
5. Click Login with Salesforce.

But doing that I end up in a Workbench connected to the main production org for my work. Any advice?