IntelliJ Idea Main Menu Bar Moved From Mac Menu Bar

Make sure you have apple.laf.useScreenMenuBar=true in Help | Edit Custom Properties. It should be already set to true by default.

Also check that IntelliJ IDEA is running on the default JetBrains Runtime.

I have been having the same issue with macOS Catalina, 10.15.4 and Intellij 2020.1 version. I had changed the intellij runtime to java 8 and that looks like it caused the issue. Changing the runtime to intellij default fixed the issue for me.

This is what I did, punch cmd+shift+A, Type "choose runtime" and then click on the Use Default button.

Edit Custom Properties solution didn't work for me, the following did work:

• press the combination CMD+SHIFT+A
• type "vmoptions"
• Edit Custom VM Options
• add "-Dapple.laf.useScreenMenuBar=false" to the end of .vmoptions file
• press the combination CMD+SHIFT+A, type "restart", Restart, Just Restart