- **Design: see what each collaborator has selected, distinct colours, and per-person undo (#5184, #5182, #5167).** On a live Design canvas, the layer another editor has selected gets a dashed outline in their colour, with their name. The server keeps the selection away from readers who may see only the shared version. Everyone present now gets their own colour, the same on every screen; before, two people could share one. **Undo** and **Redo** (toolbar, Ctrl/⌘+Z, Shift+Ctrl/⌘+Z, Ctrl+Y) take back only your own edits and never a collaborator's; a step whose property a collaborator also changed leaves the history instead of overwriting their value.