# Undo and the Op Log

Undo takes back your last steps; the Op Log lists every change and can undo any one of them.

The Op Log shows every change by every person and agent. You can also go back to a point.

## Undo and redo

| Action | Mac | Windows |
| --- | --- | --- |
| Undo | `⌘Z` | `Ctrl+Z` |
| Redo | `⌘⇧Z` or `⌘Y` | `Ctrl+Shift+Z` or `Ctrl+Y` |

- Undo works across lines: typing, new lines, deletes, moves, indents, tags, fields, type settings, and things shown on or taken off a page.
- One step per action. Typing in one line with short pauses is one step.
- Undo is yours, on this device. It never takes back what someone else did.
- Undoing your letters never removes letters someone else typed in the same line.
- Undo puts back only what that step changed and nobody has changed since. A later change by someone else stays.
- If the step happened on another page, undo takes you there first.
- Undo never takes away a day page, or a line that has lines inside it.
- In a box such as search or a field value, `⌘Z` is the box's own undo.

On a phone, Undo and Redo are in the search you pull down from the top of a page, and on the keyboard bar while you type (when Fennick is opened from the Home Screen). See [Phones](phones.md#omnibar).

## The Op Log

Open **Op Log** in the sidebar, or from the [command menu](command-menu.md). It lists every change in your notebook, newest first, by day. Each row shows:

- the time;
- who made it: you or an agent;
- what they did, such as “wrote …”, “moved …”, “tagged …”, “deleted …”. Click it to go to that line.

*Older changes* at the foot loads more.

Only changes are listed. Opening a page, stepping through days, or reading never writes anything, so none of it shows here.

On a phone, each change shows in full. Swipe a change left to see **Undo** and **Restore to here**.

![The Op Log filtered to Claude: two rows of Claude’s changes, with Undo on the row the mouse is over](img/oplog.webp)
*The Op Log, filtered to one agent.*

### Filter by who

The row of names at the top filters the log. *Everyone* shows all. Each person and agent has a button with how many changes they made. Agents are marked with ✦.

### Undo one change

Click **Undo** on a row. It puts back what that change replaced, but only where nobody has changed it since. The row is then marked *undone*.

A few rows cannot be undone: an undo, a go-back, a delete for good, and a renumbering (see [Long lists](#long-lists)).

### Restore to here

Click **Restore to here** on a row to undo every change made after it. Fennick asks first: “Undo 4 later changes?”. Click **Go back**, or **Cancel**.

With a filter on, only that person's or agent's later changes are undone: “Undo 4 later changes by Claude?”. Everyone else's work stays. A change made since is never overwritten.

### Long lists

A list can keep growing: it takes new lines however long it gets. When a very long or crowded list needs it, Fennick renumbers the order of its lines once, in the background. Nothing on the page moves.

- The Op Log shows it as *Server* “renumbered the lines of …”.
- It cannot be undone, and **Restore to here** passes over it.

> In the browser try-out, the Op Log lists your own changes. Agents' changes show here in synced notebooks (coming).

## Trash

Deleted pages and lines go to the **Trash**, in the sidebar. The lines inside a deleted line go with it.

- Click **Restore** to put one back where it was, with its lines inside.
- To delete a page: open the **⋯** menu at the top right of the page and pick *Move to Trash*. Fennick asks first. Day pages cannot be deleted.
- Deleting a tagged thing that is used elsewhere only takes it off this page. See [Deleting a tagged thing](tags.md#delete).