@badboy1985ro said in 2 player retro pi setup:

is there way to apply this for all the emulators? like nes snes etc?

/opt/retropie/configs/SYSTEM_NAME/retroarch.cfg is the system specific retroarch config file.

/opt/retropie/configs/all/retroarch.cfg is the global retroarch config file.

More info here:
https://github.com/RetroPie/RetroPie-Setup/wiki/RetroArch-Configuration#hardcoded-configurations