Here you have an overview of your apps and their connection status:

If you haven't yet connected any app store account, you can easily do so by clicking on Add Connection.

Here you can have an overview of all your active connections and available apps.

You can click Add Connection to quickly start creating a new one, or Remove app directly from here.

If you want to disconnect your App Store Connect or Google Play Developer Account go to the Google Console (under Users and permissions) and/or to App Store Connect (under Users and Access), find the specific email you invited in the first place e.g. [email protected], and remove the user from the Developer account.