By default, the Member Of list shows all of the private and restricted workspaces of which you are a member. The My Drafts list shows all of your unpublished workspaces.
To display a public workspace in the Member Of list, in the Status column in the Workspace Directory, choose Add.
The workspace is added to the Member Of section in the My Workspaces panel, and the status of the workspace in the Workspace Directory is changed to Added.