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This problem was posted previously but the answer was to update MacOS and Xcode. I am using the latest versions and the problem persists - for me at least. This is probably something really simple that everyone does and I just don't know about. I installed MacOS Monterey, XCode and downloaded the Building a Great Mac App with SwiftUI sample code so I can code along. After opening the workspace I added a developer account and added an Apple Development certificate. I think I should be able to build code now. I configure my developer team (for the target) to the development account I just setup, and the signing certificate to "Development". 2 warnings appear before I do anything: asking me to enable hardened runtime. Since it recommends I should do this, I tell it it's ok to go ahead and configure this. This gets rid of all the warnings for the moment. I open the ContentView (Part1 start -> GardenApp -> Garden App -> Navigation -> ContentView). An error shows instead of a preview: "Cannot preview the file - active scheme does not build this file". There's an information icon next to the error that reveals: "Select a scheme that builds a target which contains the current file, or add this file to a target that is built by the current scheme." When I search for "scheme" in the build settings I get nothing. This seems pretty odd. Any suggestions on how to resolve this would be great.