For information about these settings, see Set Chrome policies for users or browsers. However, if a primary user signs in to a managed Google Account, the following user policies that you set also apply to secondary accounts on the device: Subsequent users are secondary users.The data in each user account is kept separate. Or, you can allow only one user to sign in at a time.
For example, you can specify that the first user must sign in to a managed Google Account. As a Chrome administrator, you can control whether multiple users can sign in on a device.
Users can switch between accounts without signing out and in again. By default, users can sign in to multiple Google Accounts at the same time on a device running Chrome OS.