How do I switch between Google accounts on my Acer Chromebook?
When you sign in to your Google Account on your Chromebook, you’re automatically signed in to Google services, such as Gmail and Google Docs, with that account. To switch between different Google Accounts during your browsing session, just sign out of the Google service you are using (e.g. Gmail) and sign in with a different account. This won't sign you out of the Chromebook.
If you have multiple Google Accounts you can enable multiple sign-in in your account settings and you’ll be able to sign in to more than one account during your browsing session.
Note: Currently, you can only sign in to one account at a time from the main sign-in screen.
For more information, visit the Chrome OS Help Center.