It seems that the limit is per emiter and not per system if i have multiple emiter in my system i can go above the 2.3 millions particle limit.
But it still the same problem when i open my project one emiter in a NS can have more that 2.3 millions particles but once i open the niagara editor i get to the 2.3 millions limit and it doesn’t change even after i close the niagara editor