Implementations (CTRL + F12) is grayed out and I'm unable to proceed with binding my first step

Hello. I'm attempting to Get Started with SpecFlow. I've downloaded a trial version of JetBrains and followed the instructions to Create a SpecFlow project. However, I'm unable to proceed with "Bind your first step" because the "right-click on Given" > Go To > Implementation (CTRL + F12) option is grayed out. Can anyone help?

Bind the first step — documentation (specflow.org)

1. Open the Calculator feature file
2. Right-click the first Given step
3. Click "Go To"

Expected Result:

The Implementation menu option is enabled. I can click it and be taken to the step definition that belongs to this step.

Actual Result:

The Implementation menu option is disabled. I'm not able to proceed with the tutorial.

Thank you.