Disabling guest mode

You should disallow guest mode for managed Google domains.

To disallow guest mode:

1. In the Google Admin console, go to Devices > Chrome > Settings > Device.
2. On the left, select the organization that contains the desired users or enrolled browsers. To select all users and browsers, select the top-level organization. Otherwise, select a child.
3. Under Sign-in settings, for Guest mode, select Disable guest mode.
4. Click Save.