I am using this on Linux:
IntelliJ IDEA 2019.3.3 (Ultimate Edition)
Build #IU-193.6494.35, built on February 11, 2020
Runtime version: 11.0.5+10-b520.38 amd64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Linux 5.3.0-40-generic
GC: ParNew, ConcurrentMarkSweep
Memory: 4012M
Cores: 12
Registry: debugger.valueTooltipAutoShowOnSelection=true, ide.balloon.shadow.size=0
Non-Bundled Plugins: Lombook Plugin, com.dubreuia, org.toml.lang, org.rust.lang
and this version on Mac OSX:
IntelliJ IDEA 2019.3.3 (Ultimate Edition)
Build #IU-193.6494.35, built on February 11, 2020
Runtime version: 11.0.5+10-b520.38 x86_64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
macOS 10.15.3
GC: ParNew, ConcurrentMarkSweep
Memory: 1979M
Cores: 16
Registry:
Non-Bundled Plugins: net.seesharpsoft.intellij.plugins.csv, org.jetbrains.kotlin, org.toml.lang, org.rust.lang
The folders appear after I import a repository project into the IDE. Projects include Kotlin sources only and a Gradle Kotlin build script (build.gradle.kts).