@disco78 We recommend using a joystick to play in Recalbox, using it exclusively with the keyboard is not recommended.
With the Joystick, to access the Retroarch menu just press Hotkey+B (based on the SNES joystick).
You can use the Virtual Gamepad (even on smartphone), see:
https://recalbox.gitbook.io/documentation/v/francais/tutoriels/systeme/acces/recalbox-manager-interface-web https://recalbox.gitbook.io/documentation/basic-manual/getting-started/controller-configurationBut maybe this will help you:
https://forum.recalbox.com/topic/24659/tastenkombi-für-mame-menü/3
