Why do I need to restrict who can sign into my Chromebook?
Mobile Zone for Chromebook (Education Edition) needs to be installed on each user profile to provide full duty of care. Family Zone recommends that Chromebook access is restricted to users who have Mobile Zone for Chromebook installed.
How to: Restrict Chromebook Access
Sign in with your owner account
Click your account photo or icon
In the "People" section, click Manage other people
Turn on Restrict sign-in to the following users
You can view, add or remove installed Google accounts from this list