Documentation on gamepad fast forward, menu, next overlay, etc?

I am looking for documentation on buttons that are used in the retropad and other gamepad overlays, but I do not see listed here https://github.com/libretro/RetroArch/blob/master/input/input_keymaps.c. I am looking for menu_toggle, overlay_next, toggle_fast_forward, and rewind. Is there documentation for these?

What kind of documentation are you looking for?

The only file that “toggle_fast_forward” appears in is this one, it seems:

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Thanks, that is what I was looking for. I was mostly just curious as to what all controls I could add to an overlay.

Do you know if there is a way to change the fast forward rate on android?