Enabling guest mode allows users to bypass your filtering policy. Follow these steps to disable Guest Mode for your ChromeOS devices:
- Log in to the Google Admin Console.
- Navigate to Device Management > Chrome Management > Device Settings.
- Select the top level OU or the OU for all of your Chromebook devices.
- Scroll down to Sign-in Settings and select ‘Do not allow guest mode’ from the ‘Guest Mode’ drop-down.
- Click Save to apply the change.