microsoft excel - How do I stop my account name appearing in Office application title bars?

I have an Office 365 Subscription with Office 2016 installed. All of my Office Apps including Word, Excel, Access and PowerPoint include my name in the application title bar, near the top right corner, adjacent to the "Ribbon Display Options", "Minimize", "Restore/Maxmize" and Close buttons.

I'd like to take some screenshots without including my name in every screenshot. How can I prevent my name from appearing in the title bar?