To change your invoice and estimate preferences go to settings (this is the gear icon at the top right of your screen).
From there click on “Invoices & Estimates” on the left menu.
From there you can set the following:

The default invoice & estimate messages and billing terms that are shown on all invoices (You can also set a note or terms on a per customer level as well).

The default email subject and message when you email an invoice to someone.

The default message that is sent when you text an invoice so someone.

You can choose what is shown at the top of your invoices and estimates such as your phone number, email address, your website.

In the final section you can choose to hide or show any outstanding balance on invoices, show a “Past Due” stamp on past due invoices, set how many days between the time you send an invoice and it becomes past due, assign a past due late fee, and show the invoice due date on invoices.