...
You can update configuration for your existing spaces or edit default configuration (used for all spaces which are not assiociated to existing configuration).
You can toggle comments, attachments, child pages and labels.
...
You can enforce security policy for new and updated shares, you can define if expiration and password is required.
The Global Settings menu contains the "Permissions" section to restrict users that can create, edit and delete External Share links.
...
You can also mark all direct back Confluence link to be automatically removed from page content.
The "Link Settings" options allow links to have forced expiration dates and passwords, as well as a maximum link expiration time
...