title: App Sandbox capability missing in Xcode project
body: <p>According to this guide, there should be an <code>App Sandbox</code> capability in the project file:</p>
  
  <p><a href="https://i.stack.imgur.com/rtxhJ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/rtxhJ.png" alt="enter image description here"></a></p>
  
  <p>However, for some reason my app project does not have any <code>App Sandbox</code> capability that I can turn on:</p>
  
  <p><a href="https://i.stack.imgur.com/AGVuu.png" rel="noreferrer"><img src="https://i.stack.imgur.com/AGVuu.png" alt="enter image description here"></a></p>
  
  <p>Why is it missing, and how can I get it there?</p>