Quick print in a Microsoft Office 365 application (e.g. Word, Excel, Outlook. etc.), when clicked, will automatically print to the default printer without having to go through the dialogs manually.
To enable this option click the down arrow on the Quick Access toolbar at the top right of the application, then check the box for Print or Quick Print (it can say either depending on the application.
Note: This is a per application change, so to have it in all Office 365 applications it will need to be done in each.
An example in Outlook (see red rectangles):
An example in Excel (see red rectangles):
