I am using the cores selected by Launchbox in this case “snes9x_libretro” for SNES and “dolphin_libretro” for the GC
in the Retroarch/config folder there are a number of folders relating to the various system cores. There are 5 folders named Snes9x and various year 2002, 2005, 2005 plus, 2010 appended. Inside those folders are duplicated .cfg files named after the games installed for the SNES platform.
There are 3 Dolphin related folders all having the relevant .cfg files for installed games except for the dolphin-emu folder.
Those .cfg file point to the corresponding input_overlay .cfg file in :/overlays/GameBezels/SNES/ or :/overlays/GameBezels/GC.
The text in the various .cfg files appear to be the same (depending on system and game) as all the other installed platforms except the bezels don’t display when running the games.