# ui.SplitPanel.setOrientation

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Sets the panel's orientation; one of "horizontal" or "vertical".

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Returns this split panel.

| Usage | Returns |
|---|---|
| `SplitPanel.setOrientation(orientation)` | ui.SplitPanel |

| Argument | Type | Details |
|---|---|---|
| this: `ui.splitpanel` | ui.SplitPanel | The ui.SplitPanel instance. |
| `orientation` | String | The new orientation. |