It doesn't.
There's no men league.
It's open and women.
We are still a decade away from when women will consistently participate in open section.
There was Judith Polgar (read about her) who was consistently in world top 10 in 90s and 2000s.
She was the youngest GM ever and broke the record held by Bobby Fisher.
Now, we have a 9 year old prodigy in England, who's World #1 in her age group.
Apart from these one offs, we don't have women who can compete with men at the Super GM level (2700+).
Hopefully this will change, because there's nothing fundamentally stopping women from competing with men in chess (apart from obviously the numerous sexual assaults from coaches, male staff members, male organizers, senior male peers, male commentators)