*Source:* [JetBrains](https://blog.jetbrains.com/idea/2012/03/custom-code-folding-regions-in-intellij-idea-111/)
**Question:** How can I fold a multiline Kotlin function with expression body in Android Studio or IntelliJ IDEA?
**Answer:** The folding is only available for regular function, for multiline function with an expression body such as:
```kotlin
fun fizzBuzz(i: Int) =
when {
i % 15 == 0 -> "FizzBuzz "
i % 3 == 0 -> "Fizz "
i % 5 == 0 -> "Buzz "
else -> "$i "
}
```
Select the whole function or a region that you want to fold -> `Ctrl+Alt+T` (Surround With..) -> choose either “<editor-fold..>” or “region..endregion”