Remove an account
You can remove an online account which you no longer want to use.
Many online services provide an authorization token which your desktop stores instead of your password. If you remove an account, you should also revoke that certificate in the online service. This will ensure that no other application or website can connect to that service using the authorization for your desktop.
How to revoke the authorization depends on the service provider. Check your settings on the provider’s website for authorized or connected apps or sites. Look for an app called “GNOME” and remove it.
Open the Activities overview and start typing Online Accounts.
Click on Online Accounts to open the panel.
Select the account which you wish to remove.
Click the - button in the lower-left corner of the window.
Click Remove in the confirmation dialog.
Instead of deleting the account completely, it is possible to restrict the services accessed by your desktop.