I have a tablet with Android 5.0.1. I am the main User. I have set up a Restricted User account (Settings > Users). When I log into this account and open, for example, Google Play Books, it's showing all the books associated with the main User's Google ID. This is a security issue. I want the second account to be able to a separate Google ID associated with it. From within this Restricted account, when I go to Settings > Accounts, I see no way to add a second Google ID specifically for this second user. Any ideas?