If you remain signed in for an extended period on the same computer with cookies enabled, Gmail will log you out when the cookie expires. How do I log out of a default account in Gmail?

If your computer stays at home or in a secure office and no one else ever uses it, then it's perfectly all right to leave yourself signed into your Google account at all times. The same is true if ...

From here, you need to click the Windows computer from which you want to remove your Gmail account. Then, click the Sign out option to log out of the account. That’s all! Hope these guides helped.