You can manage your workspaces by hovering your mouse over the left-hand navigation menu until it expands. Then click the down arrow to expand the list of available workspaces.
Once expanded, you can click on any of the available workspaces or click ADD WORKSPACE to create a new one.
The Workspaces page shows all the Workspaces you belong to and the workspace type (Free, Pro, Enterprise). You can edit the properties of any Workspace you created.