Only your property detail pages come from your PMS. Their descriptions, photos, amenities, and pricing refresh on every sync, so make edits to those in your PMS, not on the website.
Every other page (home, about, area guides, property management, contact, and similar) is a regular page that lives on the website itself. Nothing syncs over those pages, so edits you make in the page builder stay.
Saving in the page builder. A change is saved only when you click Save Layout. Cancel rolls back to the last saved version.
On a pre-launch site, your edits stay private until the site goes live.