Diagonals D-Pad not working

Hello, I use RetroArch in combination with LaunchBox on a PC with Windows 10. For my first trys, I installed some SNES cores and tested to play. All seems fine, but impossible to use the diagonals (up and right, up and left, down and right, down and left). I don’t know where to looking for the settings ? LaunchBox ? RetroArch ? Core options ?

Thanks in advance for your help :slight_smile: