Because your Google Account through your work, school, or other group now works more like a full Google Account, your browser's cookies will be carried across products at sign in. That means that if you visit another Google product while signed in to your Google Account through your work, school, or other group, you'll automatically be signed in with that account.
When you’re automatically signed in with your Google Account through your work, school, or other group, you will see only data associated with that account. If you previously used a product with another account and are then automatically signed with your Google Account through your work, school, or other group, you either won’t see data from your previous account or you might be asked to set up a new profile for that product. Don’t worry—your data is safe. To access this data, sign in with your previous account.
If you'd like to be able to access multiple accounts at once in the same browser, you can enable multiple sign-in. You can also sign in to different accounts on different browsers.