Go to the Policies tab under Permissions and select the type of users who can create spaces and courses.
To allow everyone in your hub, select Everyone in the hub option.
To allow only admins, select Admins Only option.
To allow only selected users, select Selected Users option and pick the users from the list.

Go to the Policies tab under Permissions.
Disable or Enable external sharing.
Go to the Policies tab under Permissions.
Disable or Enable email notifications.

Hub admins can enable or disable the export of articles within the hub.
Go to the Policies tab under Permissions.
Enable or Disable article export.