Co-designing: unsaved changes lost when a collaborator saves

Learn what happens to your unsaved changes when a collaborator saves during co-designing, and how to avoid losing work.

1. During co-designing, whenever one session saves, all other open sessions receive that update live and merge it into their view.

   ✓ Checked in the product on 10 October 2026

2. To keep everyone consistent (and to prevent deleted items from coming back to life), any changes in the receiving session that had not yet been saved at that moment are discarded.

3. Designers can safely work on different rooms within the same house/project at the same time; the conflict risk is with concurrent edits to the same elements, not with sharing one design.

4. If two or more people have the same design open at the same time (co-designing), pressing undo or redo shows the message 'Undo and Redo functionality are not available while multiple users are co-designing'. This is by design: undo works by restoring an earlier version, which would silently wipe out the other person's live changes. To use undo again, have the other collaborators close the design so only one session remains.