GNOME login username prompt by default

To force the GNOME Display Manager (GDM) to show a username prompt instead of a user list by default, you must configure GDM to hide the user list. This is often done for security (to prevent username enumeration) or on systems with many users.

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sudo nano /etc/gdm3/greeter.dconf-defaults

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[org/gnome/login-screen]
disable-user-list=true
# banner-message-enable=true
# banner-message-text="Enter Username"

Optional: You can also add banner-message-enable=true and banner-message-text='Enter Username' to prompt the user.

Restart GDM

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sudo systemctl restart gdm