DosBox keyboard doesn't work on 2nd controller

On my NES Mini using RetroArch, I can set “User 1” to be “Keyboard + Mouse” and I can go down and change the keybinds for User 1 just fine, by pressing left / right to change the setting.

But if I set “User 2” to be “Keyboard + Mouse” when I go down to change the keybinds for User 2, I’m blocked from doing so. Trying to change the setting by pressing left / right has no effect, the setting stays as —

Did you try “all users control menu” (or something to that effect, don’t have exact sceen in front of me)? If not p1 is the only one who can direct menu options including binding.

Yep that setting is on.

I think this may be a certain build of RetroArch for the NES Mini (via Hakchi 2 CE), I don’t see the “Keyboard + Mouse” option for any User inputs in my desktop installation of RetroArch, even after loading the DOSBox core.