Conceptually win-acme works by chaining together five components also known as plugins, which can be mixed and matched to support many use cases. Using the “default settings” mode of the UI, the default for each plugin will be chosen for you. These defaults can be changed in settings.json.
In “full options” mode, you will be asked to pick each of these plugins.
From the command line you can also rely on the configured defaults or explicitly provide which one(s) you want. Check the command line reference to see how.