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By default the Chrombook allows anyone with a Google account to sign in. But for some, that amount of sharing might be a little too open. If you would like to limit who can sign in to your Chomebook to a specific list of users, open settings and search restrict. You’ll be guided to the “Manage other users…” button. Click that then check “Restrict sign-in to to the following users:” and add the allowed usernames in the box. Click Done and close settings and now only those on your list can sign into your Chrombook. (Don’t forget you may also want to disallow Guest access too.)