Hold the left analog stick in any direction as you launch the GameCube app from the Home menu :)

Hold the left stick in any direction right as you launch the GameCube app and before it loads. :)

Hold the left analog stick in any direction (any controller) right after you launch the GameCube app from the HOME menu to see what you want :)

Another guess is maybe games like 1-2 Switch that used the IR receiver. It appears to be absent on the new right Joy Con.