Specify the scene delegate as part of the app's Info.plist file

In a newly created SwiftUI project:

Click your project name in the left file navigator Click the app target in the following screen Click 'Info' Expand 'Application Scene Manifest' Add a row inside 'Application Scene Manifest' – Xcode will generate a <Your-Target-Name>-Info.plist file in the left file navigator Right click on the generated plist file, and choose Open As → Source Code Add the scene configuration below inside the <dict> for UIApplicationSceneManifest In a project with an existing Info.plist file:

Right click on the plist file in the left file navigator, and choose Open As → Source Code Add the scene configuration below inside the <dict> for UIApplicationSceneManifest

<key>UISceneConfigurations</key>
<dict>
    <key>UIWindowSceneSessionRoleApplication</key>
    <array>
        <dict>
            <key>UISceneConfigurationName</key>
            <string>Default Configuration</string>
            <key>UISceneDelegateClassName</key>
            <string>$(PRODUCT_MODULE_NAME).SceneDelegate</string>
        </dict>
    </array>
</dict>