Welcome and thanks for reaching out to us here in the Community. I'm here make sure that you'll get the help that you need about the preview of an invoice in QuickBooks Online (QBO).
In order for me to provide you with the best resolution, can you please add some additional information about your concern? For example, did you notice any changes when reviewing invoices before sending them?
You can leave a comment below by clicking the Reply (green) button to add more details.
I'm looking forward to your response, @fpigs. Take care and have a good one.