Karabiner-elements: Unable to modify fn and menu key

[Joilence]

macOS 10.13.1
Karabiner 11.3.0
Keyboard: Logitech G Pro

My keyboard is 87-key, with fn and menu key in the left of arrow key.

I'm planning on modifying fn/menu/right-ctrl/right/shift to left/down/right/up arrow, but find it unable to modify fn and menu key, what should I do?

Thanks.

[nguyenhimself]

You can't remap non-Apple FN keys.

999

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[marcschulder]

Unlike the FN key, the menu key can be mapped. Use Karabiner-EventViewer.app to easily check which key name it has. For me it was application, rather than menu.