Maybe it helps?!?
8BitDo Pro 2 Wired don't have the "Mode Switch" to select type of pad like the wireless pad.
The default mode ist S-Input for Nintendo Switch / XBox Mode.
Before you connect the controller, hold B-button and connect it.
At this time it switches to D-Input for Android-Mode.
After this Recalbox can recognize the controller named "8BitDo Pro 2".
But you have to do this every time you start Recalbox.
For Windows press X-button for X-Input, that it.