I just closed the Project Configuration dialogue box via the Enter key and realised that CafeTran Espresso 2019 isn't consistent in its keyboard shortcut to close dialogue boxes. Sometimes it's the Enter key, often it's the Control+Enter (Cmd+Enter) keyboard shortcut.
I would be good to strive for a consistent user experience. My suggestion: use the Enter key.
An often used keyboard shortcut to insert a new line is SHIFT+ENTER.