> For the complete documentation index, see [llms.txt](https://gitbook.ziyuesinicization.site/filters-api/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gitbook.ziyuesinicization.site/filters-api/advanced/configuring-reserved-button.md).

# Configuring reserved button

<figure><img src="/files/ZjtcXHKygWMfs44Az9Jy" alt="" width="563"><figcaption><p>The third button on the left is "reserved button".</p></figcaption></figure>

Filters API has a third button for all tabs. Usually, it can be used to open the options menu.

{% hint style="info" %}
The core of the button is `onPress`, the shows of the button depend on whether `onPress` is `null`.
{% endhint %}

Call `FilterBuilder.setReservedButton(ItemGroup, Text, PressAction)` to add the "Reserved button".

```java
FilterBuilder.setReservedButton(CREATIVE_MODE_TAB, new TranslatableText("tooltip.modid.options"), button -> foo());
```

{% hint style="warning" %}
Icon UV is not available in 1.20.6 or above.
{% endhint %}

By default, the icon of the button is the icon that the showcase image above shows. If you want the customized icon, call `FilterBuilder.setReservedButton(ItemGroup, Text, PressAction, Identifier, int, int)`

```java
FilterBuilder.setReservedButton(CREATIVE_MODE_TAB, new TranslatableText("tooltip.modid.options"), button -> foo(), ICONS, 16, 0);
```

## See also

{% embed url="<https://maven.ziyuesinicization.site/javadoc/releases/ziyue/filters/raw/ziyue/filters/FilterBuilder.html#setReservedButton(net.minecraft.item.ItemGroup,net.minecraft.text.Text,net.minecraft.client.gui.widget.ButtonWidget.PressAction)>" %}
The javadoc (1.16\~1.19.4)
{% endembed %}