Amending STOP button on Harmony remote with Amazon Fire TV

When I press ‘stop’ on my Logitech 950 remote when watching a film, it takes me back to the main Kodi menu but doesn’t stop the film from playing.

I downloaded the keymap editor script via Program Add-ons and tried using that, but then my back button stopped working!

Is there a keymap line I can use to make this happen, or something else I can do, does anyone know?

Thanks in advance.