# Landmarks: Extending horizontal scrolling under a sidebar or inspector Improve your horizontal scrollbar’s appearance by extending it under a sidebar or inspector. ## Overview The Landmarks app lets people explore interesting sites around the world. Whether it’s a national park near their home or a far-flung location on a different continent, the app provides a way for people to organize and mark their adventures and receive custom activity badges along the way. This sample demonstrates how to extend horizontal scrolling under a sidebar or inspector. Within each continent section in `LandmarksView`, an instance of `LandmarkHorizontalListView` shows a horizontally scrolling list of landmark views. When open, the landmark views can scroll underneath the sidebar or inspector.  ## Configure the scroll view To achieve this effect, the sample configures the `LandmarkHorizontalListView` so it touches the leading and trailing edges. When a scroll view touches the sidebar or inspector, the system automatically adjusts it to scroll under the sidebar or inspector and then off the edge of the screen. The sample adds a [`Spacer`](/documentation/SwiftUI/Spacer) at the beginning of the [`ScrollView`](/documentation/SwiftUI/ScrollView) to inset the content so it aligns with the title padding: ```swift ScrollView(.horizontal, showsIndicators: false) { LazyHStack(spacing: Constants.standardPadding) { Spacer() .frame(width: Constants.standardPadding) ForEach(landmarkList) { landmark in //... } } } ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)