It’s nice to see you in the Community, glassmanhero.
I’ll be glad to provide some information about the Message on statement field in QuickBooks Online (QBO).
When you enter a message in the mentioned field on the invoice, your clients will not see the information. If you send statements to customers, this will show up as a description for the sales entry.
Let me share some links below to learn how to send statements to show customers summaries of their invoices, payments, credits, and balances. These resources provide information about modifying or setting up customer messages.
Reach out to me again if you have additional questions about invoices or statements. I’m always ready to answer them for you. Have a great weekend and stay safe.