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

# Y-axis (left axis / right axis)

> To access the configuration options for the Y-axis, click the  (configuration options) icon to the right of the  label:

<img src="https://mintcdn.com/omni-e7402367/LV2c4CXjbFMv1AXp/images/docs/visualization-and-dashboards/configuration/assets/images/y-axis-option-icon-9843f54b22e07582744ed294941ebe1d.png?fit=max&auto=format&n=LV2c4CXjbFMv1AXp&q=85&s=4db898264a2fc0408f01507088a3b8fc" alt="" width="512" height="127" data-path="images/docs/visualization-and-dashboards/configuration/assets/images/y-axis-option-icon-9843f54b22e07582744ed294941ebe1d.png" />

## Options

<Check>
  These settings control only the axis itself. To customize the [series mapped to the axis](/visualize-present/visualizations/configuration/series-configuration), use the dropdown next to the series/field.
</Check>

The settings in the **Y-Axis** tab control the title, type, domain, scale, and stacking of the axis.

### Axis types

The **Type** setting controls the type of Y-axis used in the visualization. Omni will select a default axis type depending on the data in the query, but you can override it using this setting.

**Note**: Depending on the selected type, some settings - such as domain and scale - may become unavailable.

## Labels

The settings in the **Labels** tab allow you to customize how labels associated with the Y-axis display in the visualization:

* **Show labels** - If enabled, labels will display on the Y-axis

* **Show axis line** - If enabled, a line representing the Y-axis will display

* **Show ticks** - If enabled, ticks will display along the Y-axis

* **Font** - Options for customizing the styling and color of Y-axis labels

  <Check>
    When selecting axis colors, note that there aren't separate settings for light and dark mode.

    The default palette will adjust colors based on the selected mode - such as a dark axis in light mode - but when explicitly defined, the color you select will be used in both light and dark mode.
  </Check>

* **Format** - Defines the format Y-axis labels use, such as the number of decimals for numbers

* **Label rotation** - Controls the degree of rotation for Y-axis labels

* **Ticks** - Controls the number of ticks that display between labels

## Reference lines

<img src="https://mintcdn.com/omni-e7402367/LV2c4CXjbFMv1AXp/images/docs/visualization-and-dashboards/configuration/assets/images/y-axis-reference-line-a26e17563d421a65b61f5b184a39cc46.png?fit=max&auto=format&n=LV2c4CXjbFMv1AXp&q=85&s=4f3cf9244d9d1c1f1830703578c56794" alt="" width="1664" height="1186" data-path="images/docs/visualization-and-dashboards/configuration/assets/images/y-axis-reference-line-a26e17563d421a65b61f5b184a39cc46.png" />

Settings in the **Reference line** tab allow you to define a reference line, which is a quick way to set targets on a chart. There is limited configuration for these, so more complex use cases may be better served with table calculations as a regular, independent series.

## Grid

Settings in the **Grid** tab control if and how grid lines display in the background of the visualization.

## Vega-lite options

Long-tail axis configuration is available in the [Vega-lite spec](https://vega.github.io/vega-lite/docs/axis.html).