---------------------- To enable both collapsing and un-collapsing of the sider in the Ant Design `` component, you need to ensure that the sider's trigger (the arrow button) is visible and functional for both states. In the default `` implementation, the trigger should automatically switch between the '<' and '>' icons depending on the collapsed state. If you are not seeing the un-collapse ('>') arrow after collapsing, it may be due to a custom implementation or style override. The default behavior, as shown in the code example below, uses a trigger button that toggles the collapsed state: ```jsx setCollapsed(collapsed)} trigger={ !isMobile && ( ) } > {/* ... */} ``` This implementation ensures that when the sider is collapsed, a '>' (RightOutlined) icon appears, allowing users to un-collapse it. If you are using the default ``, this behavior should be present. If you have customized the sider or its trigger, make sure your custom code includes a similar toggle mechanism for both collapse and un-collapse actions. If you want to control the collapsed state programmatically or from elsewhere in your app, you can use the `useThemedLayoutContext` hook, which provides `siderCollapsed` and `setSiderCollapsed` for toggling the state:

Uncollapse ThemedLayout sider

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