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# UISplitViewController.DisplayMode.oneOverSecondary

One sidebar is layered on top of the secondary view controller, leaving the secondary view controller partially visible.

```
case oneOverSecondary
```

## Discussion

This display mode shows one sidebar layered on top of the secondary view controller, partially obscuring it. The sidebar shown is the primary column for [`UISplitViewController.Style.doubleColumn`](/documentation/UIKit/UISplitViewController/Style-swift.enum/doubleColumn) interfaces and the supplementary column for [`UISplitViewController.Style.tripleColumn`](/documentation/UIKit/UISplitViewController/Style-swift.enum/tripleColumn) interfaces. The secondary view controller is dimmed out, preventing interaction with its view. Touching the dimmed view dismisses the overlay and returns the interface to the [`UISplitViewController.DisplayMode.secondaryOnly`](/documentation/UIKit/UISplitViewController/DisplayMode-swift.enum/secondaryOnly) display mode.

This display mode is available for the [`UISplitViewController.SplitBehavior.overlay`](/documentation/UIKit/UISplitViewController/SplitBehavior-swift.enum/overlay) split behavior.

---

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