A list of all Spaces, as well as the number of members and Guides part of that Space.
As the admin, you can view and change the Space type for any Space except private Spaces that you have not been invited to. Only an admin can modify these settings.
To create private Spaces, you will need to sign up for a subscription.
Note 1: Making Spaces Public - You cannot change the permissions of a Space to "Public" if it includes any private guides. This is a security feature to ensure no private guides are accessible outside your Space / Organisation.
Note 2: Switching from Private to Open - If you modify a Space from "Private" (members have to be invited to access it) to "Open", it will be available and in the Space list of every member of your organisation. If you accidentally switched a private Space to open, see the next note.
Note 3: Switching from Open to Private - Once you switch a Space from Open to Private, all existing members of an organisation will still have access to this Space (because it was in their account), however new members will not be able to see or access this Space (unless specifically invited). To remove members from this Space, you will need to go to the Space members tab in the Space, see also Inviting & Removing People.