FinalBuilder's Design mode consists of three main sections:
Project/Action Types/Action Inspector
This section contains four tabs:
Action Lists
This is where you create and edit the actions of your project. There are two built-in action lists, Main and OnFailure. You can also add extra Working with the Action Types Panel.
Log/Script Editor
There are several tabs in the bottom section, but the most relevant ones during design of your project are the Quick Help.