It's possible to be a member of more than one Fusion hub. You can set one of them as a default or leave one if you no longer need it. Do this using the Fusion web client in the Configure Hubs page.
In the Fusion web client, click the User Profile button
in the upper right of the Fusion web client.
Click Settings.

The Configure Hubs page opens.
You can leave a hub if you no longer need access to it. When you leave a hub, your account in that hub is listed as inactive and can be reactivated by the hub admin.
You can't leave a hub if:
After you've left a hub, if you would like to rejoin the hub, contact the hub admin and ask them to re-activate you as a hub member.