4 player support problem

[y0da89]

Hello.
I plan to make a retrogaming week end with some friends.
I tried some 4 players games on NES SNES ans genesis.
Unfortunately, none of the emulators i tried seem to support more than 2 players.
I got the same result with retroarch even if all the controllers are recognized in the menu.
Is it possible to fix my problem?
Thank you in advance

[Aressi]

after loading a game enter to game settings and controller

[waats]

I can't believe I missed that.
Thank you very much Aressi.

EDIT : Wow, forgot that I have another account...