To get all these controllers to to play nice with each other on one pc took 5 seperate retroarch installs running independent from one another, usb hub with switches, wii u adapter,
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nvidia shield pro - unable to map usb controller buttons : r/RetroArch
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Second USB controller does not work on Windows · Issue #4204 · libretro/ RetroArch · GitHub
Unplugging controller to get it to work in ES and retroarch | Recalbox Forum
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Amazon.com: 2 Pack Retro SNES Game USB Controller, kiwitatá Classic Wired USB Super PC Game Pad Controller Joystick for Windows PC Mac Raspberry Pi : Video Games
Help! Can I use these controllers for retroarch on my Xbox series x? : r/ RetroArch
Retroarch doesn't save controller settings properly : r/RetroArch