Undo or redo history is not working

Symptoms

If one or more of these match what you are seeing, you are on the right page.

• •Undo works for recent actions then stops responding
• •Redo is greyed out immediately after an undo
• •Undo affects the canvas when you expected it to affect the timeline
• •History was lost after reloading the page

Causes and fixes

Ordered from most to least likely. Work down the list — each cause is paired with what to do about it.

1. 1

   Undo History Depth has been set to a numeric cap.

   Open Edit → Preferences (Ctrl+,) and check Undo History Depth under General. The default is unlimited; a cap trades history for lower memory use on long sessions.

2. 2

   Redo was invalidated by a new action.

   Performing any new edit after an undo discards the redo branch. This is expected behaviour — there is one linear history, not a tree.

3. 3

   The page was reloaded.

   Undo history is session state and does not survive a reload. The project itself is preserved by sync; the history is not.

4. 4

   Keyboard focus is in a text field rather than the canvas.

   While editing a text element or a numeric field, Ctrl+Z applies to that field. Press Escape to deselect first, then undo.

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