Display Name on Welcome Screen

Hi all. I've been able to configure the system so that if someone has a preferred last name it is reflected in place of their legal first name. The only hang up I am having is on the Welcome screen (see screenshot below). We are a global company, so I see a lot of 'local' name configurations, but I'm solely focused on the US for now. So, I've changed all the Global settings, and there is no 'local' setting for US, so I'm not sure what I'm missing. Is this one config'd in a different area besides Manage Person Name Formats