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Or does such a concept not exist and IntelliJ just looks at all source folders and computes shared parent folders?

For sure not parent of all paths, because if you have something in `build/generated/...` IntelliJ does still mark the modules correctly.

But I think IntelliJ indeed just does some common-parents and name-matching logic to determine how to display it.

If you for example have
```sourceSets.main {
    java.setSrcDirs(listOf(layout.buildDirectory.dir("bar"), layout.projectDirectory.dir("src/main_foo/java")))
    resources.setSrcDirs(listOf(layout.projectDirectory.dir("src/main_foo/resources")))
}```
then you get content roots `.../build/bar` and `.../src/main_foo` with in the tree displayed as `main_foo [main]` and `bar [main]`.

So I don't think there is the concept of "module directory", just some IntelliJ display magic

:+1: Thanks for the answer and for checking <@URQ797WRW>