In AX the customer facing documents have always needed some modification in the implementation to get the formatting to look ok for presentation to a customer or vendor. The same is true for D365 but there is some optional reports that you can download called the modern report design templates. These new reports use some setup called document branding that you can find in organizational administration.
This gives you are few parameters like some extra logo options, coloring, additional notes. There are 14 reports that come in the download which are
Free Text Invoice
Two Project Invoices
Purchase Packing Slip
Purchase Receipt List
Sales Packing Slip
Each different document users some of the branding parameters as appropriate for that reports. It should also be noted that this is available from platform update 3.
Here is a quick overview.
D365FO 1611 – Update3 (7.0.4307.16141)
You can read more about it here