> ## Documentation Index
> Fetch the complete documentation index at: https://docs.encord.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Groups & Multi-Modal

This documentation provides specific information on annotating and reviewing [Data Groups](/platform-documentation/Curate/data-groups/index-data-groups) - including multi-modal groups in the Label Editor.

## Review Data Groups

Reviewing Data Groups requires you to switch between tiles to view annotations on each data unit. You can switch tiles by:

* Selecting the tile in the left-side menu.
* Clicking **Review from this tile** on a specific tile.

Both methods are synchronized. For example, clicking **Review from this tile** on a tile also selects it in the left-side menu.

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## Options and Settings

### Synchronized Zoom

When working with a Data Group, you can synchronize the zoom level and pan position across all tiles simultaneously. When enabled, zooming or panning in one tile automatically mirrors the same viewport to all other tiles in the Data Group.

<Note>
  Zoom synchronization applies to tiles containing images and videos. Tiles with 3D scenes or other non-2D content are not affected.
</Note>

To enable synchronized zoom:

1. Open the Data Group in the Label Editor.
2. Navigate to **Settings**.
3. Enable the **Sync zoom across tiles** toggle.

### Synchronize Playback

You can synchronize playback for all audio and video files. When enabled, playback on all media files occurs simultaneously.

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  <img src="https://storage.googleapis.com/docs-media.encord.com/static/img/synchronize-playback.png" width="900" />
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1. Open the Data Group in the Label Editor.
2. Click the *Synchronize timeline across files* button in the top-right corner.

<Note>
  To ensure all data units remain in sync, make sure they are all the same duration.
</Note>

### Single Editor Timeline Setting

To display only a single editor timeline for groups of data:

1. Click **Synchronize timeline across files** in the Label Editor toolbar.
2. Navigate to the *General* Settings.
3. Enable the *Single synchronized timeline* toggle.

<Info>
  The single editor timeline only shows annotations on the tile currently selected for annotation or review.
</Info>

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### Cross-Tile Object Instantiation

When working with data groups, you can instantiate objects across multiple tiles for supported file types. This feature allows you to create annotations that span across different data units within the same group.

The **Instantiate object in frame** button appears in the annotation toolbar when:

* You're working with a data group containing supported file types
* Single synchronized timeline is enabled
* You have an object selected that can be instantiated across tiles

### Select Tiles

When using the configurable editor with a Data Group, the object table header includes a tile picker dropdown. This control lets you filter the instance list to a specific tile and set it as the active tile without leaving the object table.

* Select a specific tile from the dropdown to filter the instance list to that tile's annotations and set it as the active tile.
* Select **All tiles** to view instances across all tiles in the group.
* When **All tiles** is selected, the **Detect with SAM** (sparkles) and **Auto annotation** (wand) buttons in the object table header are disabled. Select a specific tile to enable them.

<Note>
  The tile picker in the object table header and the tile picker in the Bulk Operations drawer use the same underlying control. Selecting a tile in either location sets the active tile for the editor.
</Note>

<Info>
  The tile picker only appears in the object table when working with Data Groups in the configurable editor. For single data items, the object table shows all instances directly.
</Info>

### View Metadata for Data Groups

When working with Data Groups, you can view metadata for different data items within the Data Group using the metadata panel.

**Access Metadata Panel**:

1. Click the **Metadata** button in the Label Editor header to open the metadata panel.
2. The panel displays on the right side of the editor.

**Select Data Items for Metadata**:

When viewing a Data Group, the metadata panel includes a tile selector dropdown that allows you to choose which data item's metadata to view:

1. Open the **Metadata** panel.
2. Use the dropdown at the top of the panel to select between:
   * **Data Group** - Shows metadata for the entire Data Group
   * **Individual data items** - Shows metadata for specific files within the group

<Info>
  The tile selector only appears when working with Data Groups. For single data items, the metadata panel shows information for that item directly.
</Info>