By default when the screen is locked, the splash shield will show the user's
full name. This should be disabled to prevent casual observers from seeing
who has access to the system. This can be disabled by adding or setting
show-full-name-in-top-bar to false in
/etc/dconf/db/local.d/00-security-settings. For example:
[org/gnome/desktop/screensaver]
show-full-name-in-top-bar=false
Once the settings have been added, add a lock to
/etc/dconf/db/local.d/locks/00-security-settings-lock to prevent user modification.
For example:
/org/gnome/desktop/screensaver/show-full-name-in-top-bar
After the settings have been set, run dconf update.