Your published page and your draft are separate.
Drafts
Every edit is saved to the draft automatically (server and browser). Close the tab and come back later — you continue where you left off. Visitors never see the draft.
Publishing
Publish makes the draft live. If the username is taken you are warned before publishing.
Undo
The undo (↶) button steps back through the last 50 changes. To return to the live version, use Settings → Publishing → Discard draft.
Hiding the page
You can unpublish from Settings; the address returns 404 but nothing is deleted.
