Hi Stacey21
Thanks for your post.
I have tested this in my software with a client who had professional layout set up and creating an invoice in the browser version didn't change that setting for me. It also appeared as a professional invoice when I sent it to myself.
You can adjust the layout of the invoices back to professional in your desktop version when you click on Layout. Alternatively, use the Sales Easy Setup Assistant to set a default sale layout for all new customer cards (Setup menu > Easy Setup Assistant > Sales > Layout). You can also set a customer-specific layout in the Selling Details tab of a customer’s card.
Let me know how you are creating these invoices and where the invoice format has changed for you.