The extension settings can be configured as per below:
Navigate to Tools | Options | SpecFlow | General | to access the extension settings.
You must edit the specflow.json config file to access the extension settings. If you don’t have the specflow.json file you can add it by right clicking on the SpecFlow project -> Add -> New item… -> Add SpecFlow configuration file.
The configuration file has a JSON schema , therefore you will see all available properties as you start typing.
You must build your project for the changes in specflow.json to take effect.