For security reasons, anytime you leave your classroom, you must Lock your Chromebox.  This will prevent other users from accessing your Chromebox.  If you have previously set up your Pin, you can quickly re-enter it later to access the Chromebox.  If you have not set up a Pin, you will need to enter your full SSO credentials to access the Chromebox.

To do this:

1. Tap the clock in the lower right corner of your screen to get to Settings

2. Tap the Power button

3. Tap the Lock button