The member section allows you to see all members that have access to your Organisation, change their permissions (Admin, Admin - Not Host, or Member), remove them completely from the account, or invite new ones.

Upgrading to Teams will give you additional permission and detailed view of the members in your organisation such as the most recent Guides they viewed and the Spaces they have access to.

NOTE: Individual members (non-admins) can be admins of Space. Only promote a member to admin of your Organisation if you want them to have Organisational access and permissions.