After installing Enterprise Edition, I see the main menu only when I hover over the screen (with the clock on the right). I accidentally pressed a button, and now I can’t hide the main menu.
I'm on Lubuntu.
Have you tried View → Enter full screen? Or is this not what you are looking for?
Intellij version 2019.2 has a built-in function.
To disable the main menu, click " View > Appearance then uncheck" Main menu .
View > Appearance
Main menu