# fixedLayout(width:height:depth:) Centers the preview in a fixed-size, 3D container. ``` @MainActor static func fixedLayout(width: CGFloat, height: CGFloat, depth: CGFloat) -> PreviewTrait ``` ## Discussion This is the same as [`PreviewLayout.fixed3D(width:height:depth:)`](/documentation/DeveloperToolsSupport/PreviewLayout/fixed3D(width:height:depth:)). --- 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)