Article: Go to https://myaccount.google.com/ in your computer's web browser. This method allows you to see a list of places where your Google account is currently signed in. If you see an option that you don't recognize, you can sign out the account and change your password. You'll find this link below the "Sign-in & security" heading on the left side of the page. If you aren't logged into your Google account, you'll be prompted to log in before you can proceed. It's on the right side of the page, just below the "Recently used devices" heading. Each item on this page is a location on which you're signed into your Google account. If you see a platform that you don't recognize (e.g., a computer), click the platform's name, click the red REMOVE button, and click REMOVE when prompted. . If you had to sign out of an unknown platform, you should change your Google account password immediately. This will prevent future hacking. Be sure to use a password that's unique to your Google account.

What is a summary?
Open your Google account page. Click Device activity & security events. Click REVIEW DEVICES. Review your login locations. Sign out of a platform. Change your password