In Extensis Connect, you may be invited to be a member of more than one “account”.
An account in this sense is a distinct license to use Connect.
You may be invited to join more than one account in your organization, for example, if they each have a license to Connect, and you do work for both.
If you are a contractor, you might be invited to join accounts for multiple clients.
To change the account that you are working in, click the account menu (your avatar or initials at the top right), then choose an account from the menu.