title: Kotlin - Multi platform feature
body: <p>I'm currently playing around with Kotlin multi platform feature and have a minor problem. When I start gradle multi-platform project in Intellij and use keywords 'actual' and 'expect', they are underlined in red and show message "The feature "multi platform projects" is experimental and should be enabled explicitly"</p>
  
  <p>How can I explicitly enable multi platform feature?
  Thanks</p>