Why can't I find a functional area I want to set up for my offering in the list of the functional areas shown on the Setup page?

For a functional area to appear in the list, it needs to be enabled as part of the feature opt-in configuration.

If you have permissions to configure offerings, select Change Feature Opt In to open the offering Opt In page and enable the functional area. If you don't have permission to configure offerings, contact someone in your organization who configures the offerings and ask them to enable the functional area. Once it's enabled, return to the Setup page and you can find the functional area in the list.