The Activity Panel is where a diagram's history lives in the editor. It uses the same floating, movable shape as the Explorer and Palette: drag it to reposition, and minimise it to a dock button when you want the canvas clear. It opens, by default, in the bottom-left corner.
Scoped to the active tab
The panel only shows entries for the tab you are currently looking at. Switch tabs and the list swaps to that tab's history. The diagram still stores the history for every tab, so nothing is lost; you simply see the slice that is relevant to where you are working. This keeps a busy multi-tab diagram readable instead of mixing unrelated edits into one stream.
What each row shows
The panel header hosts the Undo and Redo buttons. Below it is a scrollable list of changes, newest first. Each row tells you:
- The author's coloured avatar dot.
- The author's name.
- A short summary of the change, such as "Edited 'API'".
- A relative timestamp, like "2 minutes ago".
- A small Revert button that appears when you hover the row.
Before any edits exist, the panel shows a friendly empty state: "No edits yet, start drawing."
Live and shared
New entries arrive in the panel as they happen. Because changes propagate through the diagram's realtime room, you see your collaborators' edits appear in the list in real time, and you see them disappear again when someone undoes or reverts. There is no need to refresh.
Each tab also has a Clear action for wiping that one tab's history when you want a clean slate, without deleting the tab itself.
The panel surfaces the most recent changes rather than the entire history at once. That keeps it quick and focused on what just happened, which is what you usually need when collaborating.
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