Yes — quite a bit. In Settings you can add your business name, contact info, license number, a logo, default payment terms (e.g. 'due in 15 days'), invoice notes, payment methods, and tax defaults — these appear on every invoice. On the Review screen, before you generate the PDF, you can also override most of these for a single invoice (payment terms, customer-visible notes, business details, a discount) without changing your saved defaults.