MultiplayerEventSystem Same UI BUG

Hi ! I have the same problem as the last guy who posted (and the one before, SAEM2710) in : https://forum.unity.com/threads/solved-multiple-eventsystem.512695/. (I am not digging up the post because it's solved)

I really can't find any answer, to believe that's why all local co-ops have split menus or cursor like Super Smash Bros, if you know a solution to this problem i am interested ! Thanks !

In short, you can't create a character selection menu like Street Fighter, because when two selectors from each player cross, one causes the other to disappear. (Then it is not superimposed either, but that's another thing). I think this is a problem with the MultiplayerEventSystem ...