How to log out of a multi-account?

For the owner of a child account:

1. Log in to your personal account.
2. Go to the "Additional accounts" section.
3. Click the "Leave" button and confirm the action.
   
   

For the owner of an administrative account:

1. Open the "Additional accounts" section.
2. In the list of agreements, find the one you want to delete.
3. Click "Delete" to exclude the agreement from the multi-account (the administrator cannot delete his own agreement).