https://zulip.com/help/restrict-direct-messages
Restrict direct messages | Zulip help center
Organization administrators can configure two types of permissions for direct messages:
messages zulip helprestrict
https://zulip.com/help/view-and-edit-your-message-drafts
Draft messages | Zulip help center
Zulip automatically saves the content of your message as a draft when you close the compose box, ensuring that you never lose your work. When you start...
messages zulip helpdraft