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Since 2018.3 IntelliJ IDEA has native support of global menu bar on Linux. To get more information see:
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I don't use a Linux based OS now and don't use the plugin. So, it's hard to maintain it.
- From JetBrains Plugins Repository
- Download plugin manually from https://plugins.jetbrains.com/plugin/7297-main-menu-toggler and install from disk
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Form the main menu: View | Main Menu.
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Find action "Toggle Main Menu" and call it. (You can use "Search everywhere"(Double-press Shift) for that)
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Assign a shortcut in settings (find "Toggle Main Menu") and use it.