User settings Dim screen when user is idle — Make the screen dim after a specific amount of time when the user is idle. Enable the compose key — Enable the compose key by default for all users. Lock down settings Allow or disallow online accounts — Enable or disable some or all online accounts. Configure single-application mode — Set up a kiosk-like, single-application system. Disable command-line access — Prevent users from accessing the command-line. Disable file saving — Prevent the user from saving files to disk. Disable printing — Prevent the user from printing documents. Disable repartitioning — Prevent the user from changing disk partitions. Disable user logout and user switching — Prevent the user from logging out and from switching a user. Disallow login using a fingerprint — Prevent the user from being able to log in using a fingerprint scanner. Lock down enabled extensions — Disallow the user to enable or disable GNOME Shell extensions. Lock down specific settings — Use the lockdown mode in dconf to prevent users from changing specific settings. Daha Çok Bilgi GNOME System Administration Guide — A guide for GNOME 3 system administrators.