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# Freeze, hide and undo column Display Changes in a View

> Hide, reorder and freeze columns in a Mammoth View without changing data, see how Display Changes differ from pipeline tasks, and review or undo them.
>
> Applies to: Where: View › Pipeline panel › Display Changes (n)

Hiding, reordering, renaming, formatting and sorting columns are Display Changes: they change how one View looks, never the data. Review or undo them in **Display Changes (n)** at the bottom of the Pipeline panel. Freezing a column is a personal setting instead. For renaming, formatting and sorting, see [Rename, format and sort columns](https://mammoth.io/docs/learn/clean-and-shape/rename-format-sort/).

## How Display Changes differ from pipeline tasks

- View-specific: each View has its own Display Changes. A new View starts with none.
- They apply at once in most cases. Number format changes need **Apply** in the formatting panel.
- They add no pipeline tasks: the Pipeline panel is unaffected.
- Renamed columns show their new names in the grid, pipeline task dropdowns and exports.
- They aren't part of automation: they are presentation only and don't run in scheduled pipelines.

Number formatting changes only how values look in this View; other Views keep their own formatting. For pipeline tasks, see [How the pipeline works](https://mammoth.io/docs/learn/clean-and-shape/how-the-pipeline-works/).

## Hide or reorder columns

- **Hide a column**: open its 3-dot menu and choose **Hide Column**. The data stays and the column is still available in pipeline task dropdowns. Exports leave out hidden columns unless the export's **Include hidden columns** option is selected. Other Views are unaffected.
- **Unhide a column**: use the [Column browser](https://mammoth.io/docs/learn/explore/column-browser/) (click the column count at the bottom of the View) or revert it in Display Changes.
- **Reorder columns**: drag a header left or right. It applies at once.

To take a column out of the data for later tasks, use Remove Column instead. See [Add, split, copy and delete columns](https://mammoth.io/docs/learn/clean-and-shape/manage-columns/).

## Freeze a column so it stays visible

In the column's 3-dot menu, tick **Freeze "order_id"** (the label shows the column's name). The column is pinned to the left of the grid and stays visible as you scroll right; untick it to unfreeze. You can freeze more than one column, though each one leaves less room to scroll the rest.

Freezing isn't a Display Change. It is your personal setting for this View: it stays after a refresh, doesn't appear in Display Changes, and other users don't see it.

## Review and undo changes in Display Changes

**Display Changes (n)** appears at the bottom of the Pipeline panel once at least one Display Change is active. Hover it for a breakdown, for example "Column Rename (1), Format Changes (2), Grid Changes (2)."

![Bottom of the Pipeline panel with a Display Changes (6) bar and a tooltip: Column Rename 2, Format Changes 2, Grid Changes 2](https://mammoth.io/docs/images/20260417_113612_BottomofPipelinepanelshowing_DisplayChanges51.webp)

Click it to open the dialog. It has three sections:

| Section | What it lists |
| --- | --- |
| **Column Rename** | Every renamed column as original name → new name |
| **Format Changes** | Every column with a display format, with before and after |
| **Grid Changes** | Active sorting, column order and hidden columns |

![Display Changes dialog Column Rename tab, mapping customer_id to customer_id_updated and order_status to order_status_renamed](https://mammoth.io/docs/images/20260417_113644_DisplayChangesmodalColumnRenametabshowing_customer_idcustomer_id_updated1.webp)

![Display Changes dialog Format Changes tab, showing order_date DD-Mon-YYYY to YYYY-MM-DD and order_amount 1000 to €1000](https://mammoth.io/docs/images/20260417_113704_DisplayChangesmodalFormatChangestabshowing_order_date_DD-Mon-YYYYYYYY-MM-DD1.webp)

![Display Changes modal Grid Changes tab showing Sorting](https://mammoth.io/docs/images/20260417_113722_DisplayChangesmodalGridChangestabshowingSorting1.webp)

To undo changes:

1. Click the X on an entry to revert it, or click **Undo changes** to revert a whole section.
2. Click the submit button. It reads **Save changes** and is disabled until you change something; after that it reads, for example, **Apply 2 changes**.

## Related

- [Rename, format and sort columns](https://mammoth.io/docs/learn/clean-and-shape/rename-format-sort/): the column menu's format and sort options.
- [Browse columns](https://mammoth.io/docs/learn/explore/column-browser/): show, hide and reorder all columns at once.
- [Highlight values with colour](https://mammoth.io/docs/learn/clean-and-shape/highlight-values/): colour cells by rule without changing data.
- [Work in the data grid](https://mammoth.io/docs/learn/clean-and-shape/data-grid/): the grid, its counts and bulk actions.

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Source: https://mammoth.io/docs/learn/clean-and-shape/display-changes.md · Updated: 2026-11-08