To log out of a default Gmail account, log out of all the already logged-in accounts. Then log into the one you want to be the default. The first one you log into is always marked as “default.” ...

To remotely sign out of your Google account, Google advises you to follow these steps: Log in to your Gmail account at gmail.com. Tap your profile icon in the top right of your screen. Select “Manage ...

If you already have access to your Gmail account and want to change your password anyway, you can do that, too. Once signed into your Gmail, click on your account profile icon in the top right corner.